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How to Measure Your Bra Size

#1

(Copied from http://www.wikihow.com/Measure-Your-Bra-Size)

Believe it or not, at least 80% of women wear an incorrectly sized bra! Most people wear a bra too large in the back and too small in the cups. And although the average bra size is often quoted as being 36C, this is just the most popular size that women buy. Most people who wear an "average" 36C bra should actually be wearing somewhere around a 32DD or even 30E.

So how do bra sizes work? Most people know that bra sizes are made up of two parts - a number and a letter. The number is known as the "band size" or "back size," and the letter is the "cup size." However, what many people do not realise is that cup sizes are in proportion to the band size, so a D cup, for example, is not the same size in every bra. A 32D is the same size as a 34C or 36B, but on a smaller frame. A 28F is actually five cup sizes smaller than a 38F, so it's not as big as it sounds![1] If you're fairly slim, then you may well need a large cup size even though your bust doesn't look any bigger than average.

Larger women may still need a small band size because this relates to the size of your ribcage only - you can still be curvy everywhere else! And losing or gaining just a few pounds is likely to have an effect on your bra size but it's not often considered even when other clothing is resized. And then there are the times when you go for so long wearing a certain size that you don't even realise it doesn't fit well anymore and you stop noticing the discomfort and treating it as "normal"! If you're looking for a better fit, here's how to find your true bra size.

Step 1: Measure your band size.
[Image: 550px-Measure-Your-Bra-Size-Step-1.jpg]
  • Run a tape measure all the way around your body just underneath your breasts and take a measurement in inches. Make sure the tape measure is horizontal and fairly snug. Your arms should be down.
  • If this measurement is an odd number, then you should try out bras in both the size below your measurement and the size above. For example, if you measured 31 inches (78.7cm), your band size could be 30 or 32.
  • If your measurement is already an even number, this is almost always your band size, but you may need a smaller or larger size depending on your body type.
  • Some bra fitting guides and calculators will tell you to add four or five inches (10 to 12.5cm) to your underbust measurement, but this is outdated advice. The "add four" method was popularized by Warners in the 1930s when bra design was in its infancy and it simply doesn't work with modern bras.

Step 2: Determine your cup size.
[Image: 550px-Measure-Your-Bra-Size-Step-2.jpg]
  • Since everyone's breasts are different in terms of shape (even between your own breasts), the most accurate way to determine your cup size is by using your current bra size as a starting point. The cups are sized relative to the band, so if you were to try a smaller band size but keep the same cup size, the cups would be too small.
  • For every band size you have dropped, you will need to increase the cups by one size. For example, if you are currently wearing a 34D bra, and you measure 28 inches, you should probably wear a 28F.
  • The majority of leading brands use UK cup sizing: AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK, L, LL. If you're shopping in the US you might see cup sizes such as DDD or DDDD. These are equivalent to E and F. If you're in any doubt, particularly with larger cup sizes, you can refer to an international bra sizing chart

Step 3: Try on a bra with the band and cup size you've arrived at in these steps. You should not regard this as your definitive size until you have tried on a few bras, and even then you will often find you need a different size in different brands or styles of bra.
[Image: 550px-Measure-Your-Bra-Size-Step-3.jpg]
  • After taking the bra off its hanger the shoulder straps will need to be lengthened. Put your arms through them and lean forward slightly so that your bust falls into the cups.
  • Fasten the bra on the largest set of hooks and eyes. Don't worry if it's tricky to fasten, if you're trying a smaller back size you will notice that you need to stretch it around you to make the hooks and eyes meet.
  • Still leaning forward, take hold of the underwires and give them a wiggle from side to side to make sure you're settled comfortably into the cups.
  • For each side in turn, slip your hand into the side of the cup and lift each breast towards the centre.
  • You will probably have to adjust the length of the shoulder straps. Slip them off your shoulders and adjust the sliders so that the straps are short enough to stay in place but don't cut in.

Step 4: Check the band size. The correct band size is the smallest you can comfortably wear. (This might be smaller than your underbust measurement-bra bands are quite stretchy, especially at 42+.) It needs to be firm enough that the bra is still fairly supportive without weighing down heavily on the shoulder straps.
[Image: 550px-Measure-Your-Bra-Size-Step-4.jpg]
  • You should be able to run your fingers around the inside of the band, but not much more. A good rule of thumb is that you should be able to fit no more than a fist under the back of the bra where your spine is at.
  • It should fit on the biggest adjustment, but will probably be too tight if you try to fasten it on the smallest size. Bras are designed to fit like this so that you can tighten the band as the elastic starts to wear out.
  • If the band is roomy enough for you to be able to comfortably fasten it on the tightest adjustment, try a smaller band, for example if a 32D is too loose, try a 30DD. Remember that the cup size has to be changed when you move to a different band size - for every band you go down, you must go up by one cup size in order for the cups to remain the same capacity and vice versa.
  • If you find the band painfully tight you should try going up a cup size because too small of cups can make a band which is too big or the right size seem ill fitting. If going up a size, maybe even several does not work, then try going a band up and a cup down, e.g. 28G to 30FF. However, try the first method before the latter.

Step 5: Check the cup size. The correct cup size should be completely filled out with no wrinkling of the fabric or space in the cups, but any spillage or "double boob" means the cup size is too small, even in low cut or pushup bras.
[Image: 550px-Measure-Your-Bra-Size-Step-5.jpg]
  • Check around the cups for any bulging, not only at the front but also at the sides under your arms.
    Make sure the underwire encloses your whole breast and lies flat against your rib cage.
  • Check at the sides under your arms to make sure the underwires are sitting on your ribs, not on soft breast tissue. If they're cutting into the sides of your breasts then you need a larger cup size. Also be aware that if you have been wearing a bra with a too big band and too small cups, you may have ended up with migrated tissue, which will seem to be armpit rolls, or back rolls. This can be fixed after getting a well fitting bra.
  • If the underwires are pressing painfully against your breastbone at the centre front you may need a smaller cup size or you could try a plunge style with a lower centre front (this is more likely to be an issue with the cups than the band.) Or you might just be human, and it's the shaping of your ribcage. In that case, wait for the bra to be "broken in" and see how it fits then, or go with the lower centre front.
  • If you think the cups might be too small but you're not sure, try on a bigger cup size as well to double check. It will usually be obvious if the smaller size fits better.

Step 6: See how it looks with your top on. You've found a new bra that fits well, maybe in a different size or style to the ones you're used to. Now it's time to see what it does for your figure! If you're trying a t-shirt bra it's also important to make sure it gives you a smooth line under fitted clothes.
[Image: 550px-Measure-Your-Bra-Size-Step-6.jpg]
  • If you look side on to the mirror, you should be able to see that your bust is approximately halfway between your elbow and your shoulder.
  • In a well fitting bra, your bustline will be supported at the right level. A lot of people find that their clothes fit a lot better, and they discover a waist that could never be seen before! If your bustline had previously been quite low because of a poorly supporting bra, you may even find that you need to wear a smaller dress size.
  • A fitted t-shirt will show up any bulges from cups which are too small, and likewise a moulded bra that is not filled out will show lines at the bust where the edge of the cups are visible. It's also useful to make sure that the colour of your bra is not showing through a thin or light coloured top - if you need to make your bra invisible, go for seamless cups which match your own skin colour rather than the colour of your top.
  • It is a common concern that wearing a smaller band size will make a big bulge around your back. However, these bulges are actually caused by the back of the bra riding up when it is too large. You should find that when the band sits lower at the back, it fits firmly and remains horizontal, rather than pushing upwards creating a bulge.

Video
This video demonstrates some of the common bra fitting mistakes and how to correct them.

Tips
  • Cup sizes above D tend to vary significantly between manufacturers, so check with the retailer or look for customer reviews before you buy online.
  • A well-fitted bra should provide 90 percent of the support from the band, and the straps the remaining 10 percent.
  • Buy bras online!
  • If you have uneven cup sizes, go with the bigger side. You can support the smaller breast by making that shoulder strap slightly shorter. If you have a significant size difference, there's always the option of wearing a chicken fillet or removable padding in the smaller side.
  • If you want your bras to last and keep their fit, never wear the same bra two days in a row, even if it has been washed. You should have at least three bras which you can wash and wear in rotation, allowing the elastic to fully recover before it is put under stress again.

Warnings
  • Many bra companies like to pretend that sub-28 sizes do not exist. However, many women really do wear bra bands sized 20, 22, 24, and 26. Some even smaller. Keep in mind, the material will stretch. Unfortunately, because the bra companies like to pretend that smaller bands do not exist since it is more profitable to them, it is almost impossible to find those sizes. Your best bets are to get a bra altered, which may not work because of the wires and how they might then dig in to your body. If you have a bra tailored, get a bra that is up one band size and down two cup sizes. As band and cups are proportionate to one another, a cup on a larger band will have larger wires. This is why you will want the smaller cups, for the smaller wires. Or, if you're in the 24/26 band ranges, check out Ewa Michalak's website. You can shoot her an email and request a custom size be made. Although you will not be able to return any custom bras you purchase there. This will give you better support than any of the "make-do" bras. Take for instance pants. You will not want pants to be so large that they will fall off without a belt, (unless you're into that style), but with bras, the lack in support can and will eventually lead to back problems.
  • This is only to give you a rough idea of what size to try on first - the fit is more important than the number on the tape measure. Because women are all different shapes, two women with the same measurements will often need a very different bra size.
  • Do not expect to need the same size in every style of bra, or to able to buy any bra in your "true size" without having to try it on. Different styles will suit different breast shapes, so two women who wear the same size in one bra might need different sizes in another bra.
  • Ignore anyone who tries to tell your definitive size from your measurements alone - especially if they tell you to add several inches to your underbust measurement. Just like dress sizes, bra sizing has changed over the years, and the old method does not work for modern bras.
  • Don't be tempted to buy the wrong size or a poorer quality bra because it's cheaper. With bras you generally get what you pay for. It's better to have one bra that fits really well, than three that are uncomfortable!
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#2

This is the page that made me completely understand proper bra sizing. I hope it can help some of you as well!
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#3

Well but wow. This means even I am wrong. I went with the assumption that my underbust was my band size, and when the bra fit nicely on the last eye, I just went with it. According to this, I should've gone down to a 30, at least in the brand I've got. Which means I might very well be a near-30B. Wow.
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#4

I think that might be another country's sizing (I'm in the US)
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#5

(07-10-2012, 12:31 AM)mochaccino Wrote:  (I'm in the US)

So am I mocha. I can also tell you that the bra's I most recently bought, the packaging went according to the add 4/5 rule, which would have put me in a band that barely even if at all touched my skin, let alone hugged tightly to my rib cage.

Next time I go, I'll maybe be trying size 30 bands, to give room for the stretch that this guide mentions.
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#6

I've said this before on the subject of bra sizing, but I'm gonna repeat it again, sorry!

The 'standard' starting point is to measure round the ribs, under the breasts and then add 4 or 5 to get an even number and that is your band size. Cups are 1 size increase for every inch your bust size ( round the nipples) is greater than the rib measurement.

The two big problems with that are:
(a) That they were derived back before WW2 by one of the large manufacturers of the time ( possibly Berlei but I can't quite remember) and female body shapes have changed markedly since then, both in bone structure, body fat levels and simply physical size because of better nutrition. It also takes no account of physical differences due to racial origin. Finally, of course, from our POV it makes no allowance for the differences between male body shape and female body shape, on top of all the other changes.
(b) When the system was devised, fabrics were extremely limited compared to now, and straps etc were all non-stretch apart from possibly a small piece of wide elastic at the back fastening, and some bras didn't have that even in the 50's.

Because of that, the "plus 4 or 5" was necessary to allow breathing and make use of body fat to give some comfort ( put a snug belt round your ribs and see what its like to try to do anything - unless you like a tight laced corset Wink ).

Now there are loads of stretch fabrics available so the tightness isn't an issue, there are now countless manufacturers and all have their own sizing methods, and there are the body shape variables I mentioned above. The bottom line is that the actual numbers on bra sizing mean almost nothing, except to get you into roughly the right area.
If you buy from one manufacturer then you might find your size and stick to it, but there will be differences from one make to another.
If you buy own-brand from a big chain store/supermarket, then you will almost certainly find they get them from an assortment of far-eastern manufacturers and there is little consistency from model to model even within one brand.

My ribs measurement is 35". In 'theory' that means I should wear a size 40. I currently wear a 36 and that is beautifully comfortable, a 40 would fall off and do nothing. Also, the edges of the underwire, at the sides, go just to the back of my boobs under the front edges of my armpits and I wouldn't want them to go back any further because it would get uncomfortable.
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#7

My under bust measurement is 29, and adding 5" to it gives me 34, which fits me perfectly. That number was confirmed by two dressmakers recently, so I know it's the right measurement. 32's are painful and the cups are positioned too close together so that they sit on top of the fat on the sides of my breasts. 36's don't even touch my skin under the armpit. They actually hang down in that area. Right now I own bras from L.E.I, Fruit of the Loom, Victoria secret, and some other brand that I don't remember, and 34 worked best in all of them. That's why I never really took issue with standard American sizing, even though it doesn't make much sense. The system doesn't work perfectly, but US bra companies really do follow standard sizing, unlike clothing companies. The band seems like it should be the least tricky part of the fit, since it's not affected very much by the style of the bra, unlike the cup size. I'm not really sure why someone would be two sizes below the band size recommended on the bra's sizing chart. It just seems like such a straightforward measurement, but maybe I'm biased because of how well it has worked for me.
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#8

Very interesting mocha. Well. I can't say it makes any sense to me either way, but this guide seems to say I should be THREE sizes below mfg recommended sizing.

MFG recommended sizing would put me in a 36 band, and would previously have put me in a 38 before I lost more fat, and before THAT it would have put me in a 40 band!

All of these at their various times in my weight loss would have put me in a bra that would have simply fallen off without doing me any good at all.

As it is, I was still wearing incorrectly sized bras as indicated by the fact that I was constantly readjusting my bra during the day.

Right now my new bras fit, but they fit on the last eye, which leaves no room for the fabric to stretch out before I need a new bra... but I might be stuck like this though, because I think in a 30, the cups will be too close.

Anyways... I'm glad the MFG recommended sizes work for you, that must mean you have the currently considered "ideal" rib cage shape. Yay you!

For the rest of us... I think this guide at least gets some of us closer to reality... And some people might need to go somewhere between or outside of either...

For whatever reason, for MANY women (and men with boobs), bra fitting remains to be the absolute most confusing part about finding clothes that fit.
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#9

nice sharing and informative for every one really interested . You done a great job .keep it up .Many young girls can get benefit form this information i their real life .
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#10

(07-10-2012, 12:31 AM)mochaccino Wrote:  I think that might be another country's sizing (I'm in the US)

It is, but the information still holds true. I think these are UK sizes.

Before NBE, I wore a small 34B or even 36B (to prevent my scoliosis back pain from bothering me). And now I realize I should have been at least wearing a 30C or D all that time. ^^;

As far as the cups not fitting properly, they should be made the same regardless of band size, so that you can drop from a 34B to a 32C and still fit. If it doesn't fit, you can even increase TWO cup sizes to find a better fit. Heck, I'm pretty sure if I were to find a 30 band bra, I'd have to go to an F cup rather than a DDD/E. Despite the fact that I wear a 34D, the 32DD actually flattens my breasts and pulls them against my body, and the cups don't properly fit around my breasts. For me, the larger bands will have my bra gapping at the top when they fit properly, and if there is no gapping it means that I'm way out of that size range. So if I were to go to my actual size, I would find that it's too tight/small. So maybe you just need to play around with it a little more.

Also, VS, as much as I hate them now (my $55 bra didn't last a whole month), their bras are actually made a half size smaller than most other brands. I've also come to notice a few "tween/teen" bra companies also size that way. So sometimes switching brands WILL make a world of difference.

Bras are difficult no matter how good a fit you can find, so in the end it does come down to personal preference. Although I have read that some women who went from 34 and 36 bands down to a 30 and 28 bands HATED it at first, thought it was too tight, but then within a few days came to LOVE the fit and found it to be perfect. So it may also have to do with getting used to the change. I'll have to let you guys know myself when I finally reach my goal and buy a proper fit. Wink
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