Offered in crisp cotton poplin, this easy-breezy shirtdress features a flattering defined waist. Offered in crisp cotton poplin, this easy-breezy shirtdress features a flattering defined waist. 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.