Elven, Glass, Scale and Dragonbone armor are, visually, far too exotic. The heavy armor after Steel is the same. Though, Ebony and Daedric are also very exotic and noticable...I only wear them as a warrior type character that isn't trying to keep a low profile, so it's okay. For a sneaky type, I want leather, nothing that sticks out, but I want it to have good stats and enchants.