Cookie Monster Costume - Large This kids Cookie Monster costume includes a plush dress with cookie printed accent, leg warmers and Cookie Monster headpiece. Our Cookie Monster girl costume comes in kids and tween sizes Large, X-Large. This Cookie Monster girl costume is an officially licensed Sesame Street costume. Group Halloween costumes ideas: Match this cute Cookie Mosnter costume with any of our other Sesame Street costumes for a fun girls group costumes theme. 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.