Bikini briefs by Jack Wills, Stretch swim fabric, Plain design, Brief cut, Machine wash, 71% Polyamide, 29% Elastane, Our model wears a UK 8/EU 36/US 4. Jack Wills launched in 1999 in Salcombe, Devon, designing British heritage-inspired goods for the university crowd. Drawing a distinctive connection between the old and new, Jack Wills take pride in their finest quality materials and �fabulously British� design across their collections of hoodies, denim and beauty.