Superman needed a cape so we could tell how fast he was leaping/flying. All others with capes are copycats. (Batman, of course, was copying bats as well as Superman.)
But as The Incredibles taught us, capes are bad (http://www.youtube.com/watch?v=KNUbPRj9TGMcapes).
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But as The Incredibles taught us, capes are bad (http://www.youtube.com/watch?v=KNUbPRj9TGMcapes).