Bikini top by Matthew Williamson, Stretch swim fabric, Halterneck style, Bead-embellished design, Secure-back fastening. The master of print and embellishment, London-based designer Matthew Williamson translates his love of travel into a collection of beachwear. Defined by laid-back, boho styles, MW by Matthew Williamson offers a range of pretty, printed cover-ups, beaded kaftans and cut-out swimsuits.