Halloween FX Cookie Monster Sassy Costume (12-14) The Sesame Street Sassy Cookie Monster includes a plush dress, knee highs and character headpiece. The Cookie Monster Sassy comes in adult sizes Large, Medium, Small. This Cookie Monster Sassy is an officially licensed Sesame Street costume. Please note: This item's color may vary due to inherent manufacturing variations or your computer monitor's color settings. The item you receive will be identical or substantially similar to the item pictured in this listing.