Shop Unisex's at RalphLauren.com, the Official Site of Ralph Lauren. Plaid Oxford Shirtdress - This cotton oxford shirtdress features a preppy plaid pattern, a cute ruffled hem and our signature embroidered pony. Peter Pan collar. Applied buttoned placket. Puffed short sleeves with buttoned closures. Ruffled hem. Our signature embroidered pony accents the left chest. Comes with a matching bloomer.