Gear Mug
It isn't really clothing related, but I'm pretty proud of this: http://img.photobucket.com/albums/v515/Lanthir/gearmug.jpg
Ceramics probably isn't the first medium that comes to mind when most people think of steampunk art, but it's what I do. The handle is entirely functional and comfortable, which I wasn't expecting at all.
I also made a few gear-shaped pendants, but they haven't been fired yet, and since I won't be at school (where I do my clay work) next semester, it may be some months before I am able to post them.