While these are only cosmetic costume options, they're important to players who wield specific guns or swords. It may seem like a minor issue to some, but having an outfit that makes sense -- and looks cool at the same time -- is surprisingly important to players who revel in a game like Champions Online.
You can also now put guitars on the back of your characters; something that immediately reeks of potential. We have to wonder if guitars are going to be added as visual replacements for sword based powers, enabling us to whack enemies with our musical axes. If someone at Cryptic could make that so, it would be somewhere within the vicinity of pure awesome.