A surcoat over some sort of leather would be ideal, especially for archers and other light classes that tend to have no way to show clan allegiance outside of their banner icon, or maybe some light mailish sort of thing, using the "Tunic over mail" as a base to work upon as far as the visual of the armor goes.
Maybe 26-30 armor, too. I know the light strange armor I'm wearing right now is 30 armor, and is only 6 pounds.