Officially it's the "Sexy Jokester" Costume from Roma Costumes. (Unofficially... it's totally Harley Quinn from Batman.) This costume features a sequin harlequin romper that laces up the back and a black eye mask. Sold separately are the Black and Red Ponytail Wig and Metallic Lace-Up Thigh High Stockings. Great for cons and cosplay as well as Halloween!