By Design Mock Neck Sleeveless Black Velvet Maxi Dress NEW with tags. Mock-neck maxi dress constructed from soft velvet is cut in a flowy maxi-length silhouette with a side slit for elegant style. Mock neck Sleeveless Partially lined Slit 90% polyester, 10% spandex Machine wash, line dry Women size Medium Approx Measurements: 58" Length 16.5" Underarm to underarm