Maybe a crazy idea and possibly a dumb one, but hear me out.
How feasible would it be to make fashion sets out of existing armor sets, so that way you could look like another class? Or, if you're not a fan of fashion sets, have the look of one armor set while wearing another one with better stats?
I figure it wouldn't be too hard to do since you'd basically just be re-using the existing icons, models and textures...