Sesame Street Costumes - Come and play, everything's A-OK with a Sesame Street costume! We have a large selection of Sesame Street costumes based on all the popular characters from the friendly neighborhood. Dress up in a Big Bird costume, Bert costume, Ernie costume, Cookie Monster costume, Elmo costume and more! Brought to you by the letter C -- for Costumes! A Sesame Street costume is not just for Halloween!