My wife shops exclusively at
Victoria's Secret. She wears a 36C when she isn't
pregnant or
breast feeding, and usually fits into them very well.
When she needed to find larger bras due to the increase in breast size she fell exactly into the gap between C and D cups.
A C cup was too small, and cut into the flesh on the tops and sides (the "cup runneth over" problem). In a D cup she could carry her keys in the extra space.
The only solution that she found was to buy a D cup bra with the "miracle" padding that she normally hates. The padding didn't affect her figure very much since the bra was much too large, but the padding helped take up some of the extra space.