How do you unlock/find costumes in Marvel: Ultimate Alliance 2

How do you find or unlock alternate costumes for the characters? I have been playing through missions and have found upgrades and other unlockables but not any costumes but each character has the option when selecting them.

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All of the costumes can be unlocked by defeating 50 enemies (except Juggernaut who requires 300), though some require a certain alignment in the Civil War. All of the 50 enemies killed can be done in missions, via replay or in the combat simulations. Be sure to unlock every costume you can for your alignment on your first playthrough before starting your second. So for instance, after Act 1 if you choose Pro-Reg, get all of Iron Man, Mr. Fantastic, etc. before starting a new playthrough or you'll miss your chance to unlock them. Characters marked as Neutral can be done regardless of which side you choose, but still have to be done after Act 1.

Pro-Registration Campaign