Bikini briefs by Matthew Williamson, Stretch swim fabric, Low-cut rise, Border print detail, Brief cut, Machine wash, 88% Polyamide, 12% Elastane, Our model wears a UK 8/EU 36/US 4. The master of print and embellishment, London-based designer Matthew Williamson translates his love of travel into the brand�s signature laid-back, boho style. The result is a collection of pretty printed dresses, oversized sunglasses, beaded kaftans and cut-out swimsuits.