I just went home and Colossus was one of the first ones that came to mind. We needed a strong guy for the team, so I drew up a strong guy. The character's armor just kind of fell into place. He was accepted pretty much as is, except that I had given him bare legs because it seemed only logical that if we're going to show him armored up, the legs should be bare like the arms. But Len Wein didn't like male characters with bare legs. So we decided that his costume would be blue when he wasn't armored up, and that we'd see his legs when he was armored up, due to the unstable molecules of his costume.