Well I'm not much of a modder but I heard how to do it first you have to model a jacket wchich you want to put on a Han model. Then put the jacket on the Han model and there you go. I was reading it on one forum don't remember which one but it was saying how to put robes on a skin but I think it's the same thing.
Turn to the light, the dark side may have cookies but we have PIE!!!