Shop Baby's at RalphLauren.com, the Official Site of Ralph Lauren. Big Pony Cotton Polo Dress - This preppy cotton mesh polo dress features a cute ruffled hem and our signature embroidered Big Pony. Ribbed polo collar. Three-button placket. Puffed short sleeves with ribbed armbands. Applied "3" patch at the right shoulder. Ruffled hem. Our signature embroidered Big Pony accents the left chest. Comes with a matching bloomer.