"I bought this for my son who is a size XL18 in boys. For some reason "they" don't make a costume that comes in that size, at least I've never seen one yet, so I resorted to buying a size Mens Small. It is a fantastic looking costume, but, it's much too long for him. The chest fits okay, but the mask is WAY too big. The mask doesn't even fit my husbands face. Overall it is nice but extremely overpiced."