MILLY Becca Cover Up in White. - size M (also in ) MILLY Becca Cover Up in White. - size M (also in ) Poly blend. Hand wash cold. Unlined. Elastic neckline and waist with tie detail. Sheer lace fabric. Neckline to hem measures approx 25 in length. MILL-WX135. 141CR013384. 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.