COS Dress Size 10 Cut Out Back Elastic Waist with Tie Short Sleeves Black with Pockets. It features short sleeves, a collared neckline, and a button closure. The dress has an elastic waist with a tie and a cut-out back. It is made of a blend of polyester, modal, and rayon fabrics, and is machine washable. The dress is midi-length and has a side slits. Size 10 Bust: 18" Length: 51" Waist: 14"