Offered in a luxe cotton-cashmere blend, the Twain Sweater features a clever detachable scarf for an effortlessly layered look. Offered in a luxe cotton-cashmere blend, the Twain Sweater features a clever detachable scarf for an effortlessly layered look. Named after the original NYC flagship store address, Derek Lam launched Derek Lam 10 Crosby in 2011 to elevate and transform everyday style through fit, form, fabric, color, and attitude.