As a Sith Inquisitor, specifically an Assassin, my chief weapon is surprise...surprise and fear...fear and surprise.... my two weapons are fear and surprise...and ruthless efficiency...
Anyway. I feel my gear should reflect that simple, subtle lifestyle of quietly sneaking up on people and stabbing them in the face.
Darth Maul's black padawan-esque outfit with the cloak? Perfect. Palpatine's robes for my sorceror alt? That would be epic. Obi-wan's robes for my level 50 Guardian? Heck yeah!
As far as the "low level" look - Take your lead from some of the KOTOR character designs. Kreia? Obviously high level, simple look, epic. Revan? Slightly more involved, but still simple & easily recognizable. Iconic. Awesome.
Keep it functional. How am I supposed to swing a lightsaber around with huge shoulderpads or protrusions on my head? That looks more fantasy than Star Wars.