[rateset]

It is more than just a difference, the fullness and shape does matter, there is a science about shapes too, for example if they are empty on top, you will have gaps on top even with the measurements like in the table. But in your case it is actually very unlikely that an A is too small for you with only 3'' difference, maybe you need bigger band size or your bras have a lot of padding or were cut smaller or not well. As I already said I could wear B cup, especially if padded, but if you like look at it in a tight T-shirt without a bra you see its very, very little tissue. Even if I do fit a bigger bra sometimes, I don't have much volume= cc, it cannot be much. I don't think that measurements are wrong and I prefer not to convince myself I was bigger than I am, simply because I can fit a bigger bra sometimes, it also depends on the label, not only the cut. And a bra is not filled only when there are no gaps, actually in most modern styles (abstract from fullcup for a moment) a big part of the breast is not in the bra, it covers only about the 60% of the breast and if you wear a size bigger than you are, most of your breast is inside of a bra, but it would still fit, if you understand what I mean. If I had more fullness, I would look much bigger and also fit bigger sizes better, but as I already said the most small girls don't have much fullness. A good cleavage comes also mostly with bigger sizes, seldom make small sizes a good cleavage.