But it's difficult to get helmets to look right (My favorite Oblivion helmet was the Steel Barbute)
And for those wanting realistic armors... do we really want a return of Oblivion's Chainmail Coif?
I actually enjoyed all of Oblivion's armors except Daedric, Ebony (I prefer larger, fewer plates, but loved the color scheme), Female chainmail (Erg... too much skin), and Elven.
Of course... once you got past Leather in the Light Armors, none of them suited a Thief anymore . That was the real failing. But, they looked good for Skirmisher/scout types. A shame Medium Armor went away :/
Problem with glass is as you have noticed it's in theory best choice for thief, but in practice sneaking in it looks extremly stupid, maybe if glass could be covered with some robe(not possible in OB), ebony was ok imo but helmet looked out of place, should be closed one, maybe not model from morrowind, daedric also screwed in topic of helmet(why not those awesome war masks i ask), besides that I can accept other models, and what do you want from mail coif dude ;P ?