[BonitaDDs]

Well I was a 32c/d at 36in start size so the adding 3inches for a doesn't make much sense I have never heard that actually yes its approximately an inch difference per cup but obviously depending also on breast shape because an across measurement only measures the cheast not the actual size of the breast this is why working cup size from only inches is only a guide which is why most fitters go by actually trying different cups with the measured band size.