OFFICIALLY LICENSED DC COMICS BATMAN PRODUCT: Officially licensed Batman Costume t-shirt boys make sit the perfect gift. BOYS SIZES: Prints are available in boys clothing sizes: X-Small-4, Small-5/6, Medium-7/8, Large-10/12 and X-Large-14/16. Let you little one be Batman for a day! The Dark Knight of Gotham City begins his war on crime with his first major enemy being Jack Napier, a criminal who becomes the clownishly homicidal Joker.