When a man selects a womans costume tow ear for Halloween, captain america costume adult it is important to look at the specific measurements in the sizing guide and compare them to their own measurements. What size should men choose when wearing a womens costume? In general, adult womens garments are sized smaller than mens, wonder woman costume so be prepared to order a larger size for a good fit. The Yandy brand of Halloween costumes come in adult styles for both sexes, and include big and tall sizes.