Isabel Maternity Black Swimsuit. Step out in comfort and style at the beach or pool wearing the Underwire Twist-Front One Piece Maternity Swimsuit from Isabel Maternity by Ingrid & Isabel. This one-piece maternity swimsuit features side cutouts along with a deep neckline for extra charm. The ruching along the sides helps accommodate your growing bump, while the underwire design with removable cups helps provide the right support and customized coverage. Designed with soft and stretchy fabric, this black swimsuit offers comfort and closes with a back hook.