Shop Baby's at RalphLauren.com, the Official Site of Ralph Lauren. Big Pony Cotton Coverall - This classic polo shirt-inspired coverall is crafted from cotton mesh and features our signature embroidered Big Pony. Ribbed polo collar. Two-button placket. Long sleeves with ribbed cuffs. Applied "3" patch at the right sleeve. Ring snaps at the hem ensure easy on and off. Our signature embroidered Big Pony accents the left chest. 100% cotton. Machine washable. Imported.