The Derek Lam 10 Crosby Buffy Short-Sleeve Tiered Midi Shirt Dress combines casual elegance with feminine flair, featuring a button-front design, short puff sleeves, and a tiered midi skirt. The Derek Lam 10 Crosby Buffy Short-Sleeve Tiered Midi Shirt Dress combines casual elegance with feminine flair, featuring a button-front design, short puff sleeves, and a tiered midi skirt. 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.