I get the idea that Bethesda's designers don't have much costume knowledge, because their designs are uninspiring. There certainly would seem to be room for you to envision whatever you can cook up. If it's good enough, they'll even make something that looks exactly like it for the next game and fail to mention the source.
Actualy it apears their designers are quite good but the programmers cant fit all the ideas into the game http://www.flickr.com/photos/47857688@N08/with/6877545789/