M&M Poncho Costume - One Size - Chest Size 48-52 This tasty adult size M&M costume includes an overhead M&M poncho with character face. Pick your favorite M&M character from Blue, Green, Yellow or Red. This M&M costume comes in adult size One Size. This M&M costume is an officially licensed M&M's costume. The black shirt and pants are not included with this M&M costume for adults.