NWT Boohoo Black Kelly Cut Out Knot Front Dress. Rock a classic with a little black dress. Make an effortless impact where ever vou are with the always cool and timeless LBD for super chic vibes. Whether you dress it up or down, the little black dress is always on trend. 95% Viscose, 5% Elastane • Black • Casual, Little-Black Measurements 20.5" Chest, 27" Length.