Using your bra size to shop for swimwear lets you fit your bikini top or one-piece to your body shape by using your unique cup size and band size combination to find swimwear by bra size. You get the support of your favorite bra but in a swimsuit. Title Nine's selection of bra-sized swimwear includes underwire bikini tops and underwire one piece options, many with removable pads and adjustable straps. With a variety of designs, from strappy v-neck underwired bikini tops to padded one piece swimsuits, you can find the suit that fits you (and your body) best.