My son is a superhero fanatic, especially for Spider-Man, Superman, Batman and the Hulk. I made these two reversible capes to help him battle the forces of evil.
I found a great superhero cape tutorial at http://pukingpastilles.com/?p=57. I suggest making a pattern out of heavy cardboard so when your child asks for another cape, it'll be easier to whip up. I also used sticky velcro circles that I found at the fabric store. For my son's Spider-Man themed 3rd birthday, I made one-sided spider capes for all the kids.