The boys Nautilus 4 piece. black tuxedo is a size 5. The sleeves of the tux coat has one button in the front for closure and two decorative buttons on each sleeve. The tux coat is beautifully lined, machine washable, and made of 100% polyester. The long-sleeved white shirt is made of a blend of polyester and cotton, and is also washable. All together, the 4 piece Boy's Nautilus Tuxedo will be a beautiful addition to any wedding wardrobe