Watermelon Costume... Fit is very roomy and forgiving- will even fit over a coat if its cold outside! (Adult sizes are based on unisex t-shirt sizes.) Click here to ask me a question: http://www.etsy.com/conversations/new?with=notthekitchensink&ref=pr_contact Its not a good idea to leave your baby or small child alone with one of my costumes on. Please supervise the kiddos at all times so that we can all have a safe Halloween! Thank you.