Plus Size Costumes Shopping for costumes as an adult right now offers as many choices as for young children. It is hard to tell who has more fun dressing up. everybody is informed of the entire line of adult costume apparel, mainly at Halloween. Are you looking for the fuller figure? Plus size costumes are becoming increasingly more available. Don’t forget about the holidays. Would you like to dress up in a Santa Suit? Mrs. Claus? Or What about a Santa Claus helper elf Suit. Dreams can come true, in the perfect costume.