A year ago, I purchased a Goddess Women's Rose Banded Underwire Bra, in a size 40I.  I really liked it!  It was an accurate size and very comfortable, even for an underwire.  I have since lost weight and I needed a smaller size under bust, but not in the cup size.  I ordered a 36I, figuring that the cups would fit the same.  This was not the case.  The size of the bra under bust is fine, but I have to squeeze into the cups.  I did not return the bra, as I plan to lose more weight, and it will eventually fit.