Der undershirts

![undershirt](https://cloud.githubusercontent.com/assets/7247232/3886743/63ef6020-21e3-11e4-85ae-6f071c3f0039.png)

Sprited credit: Frankensteined from NTstation and baystation12's undershirts.

There's not a lot right now, but contributors can add more, I just wanted to add the functionality and find a happy placement as far as fitting-on-mobs is concerned.