Shop Women's at RalphLauren.com, the Official Site of Ralph Lauren. Big Pony Mini Shirtdress - Featuring a two-button placket and our signature Big Pony, this cotton mesh minidress is inspired by our iconic polo shirt and designed with a sexy, sporty look. Ribbed polo collar. Two-button placket. Short sleeves with ribbed armbands. Even vented hem. Our signature embroidered Big Pony accents the left chest. Falls 17" from the natural waist. 100% cotton. Machine washable. Imported.