Rhiannon Knot one-piece SwimsuitZimmermann's Rhiannon Knot one piece Swimsuit features an elegant knot on the underwire and a drop opening above the waist, adding a sensual touch to the design. The straps are detachable and adjustable, and the bra is embellished with side and front gathers between the inserts. With underwire and reinforcement on the side seams, this swimsuit offers a supported, shaping fit, perfect for a sophisticated and chic look.