Wrinkling in the cups can mean the cup is too large, or that the cup shape isn't well-suited to your breast tissue. Full-coverage styles in particular can wrinkle even in the correct size if your breast tissue is naturally fuller on the bottom, because the upper portion of the cup has more fabric than you need.

Trying a different style often solves this completely. A demi cup or balconette style, which has a lower cup line, may provide a much better, more flattering fit without changing your size. Every brand and style fits a little differently, so keeping an open mind about trying new shapes is key.