MILLY Biarritz Side Tie Bikini Bottom in Blue. - size L (also in ) MILLY Biarritz Side Tie Bikini Bottom in Blue. - size L (also in ) Spandex blend. Hand wash cold. Side tie closures. MILL-WX118. 139 BS 0966. The MILLY collection epitomizes bold, advanced contemporary fashion with a feminine edge. Designer and founder Michelle Smith transforms classics by merging American sportswear silhouettes with distinctive Parisian atelier techniques. Smiths eye for impeccable detail, use of luxurious, cutting-edge fabrics and precise tailoring have made MILLY a cult favorite across the globe.