I would quite like to see a leather waistcoat - maybe in black or reddish brown - a slip on part would be much cooler than the variety of torso's that are available. I guess a part a bit like the Samurai robe from minifigcat would be pretty cool. Saying that it would be quite a fiddly piece.
On my list of ongoing projects I have the Warriors fil so such a thing would be way cool! I've seen it done before but only with original lego parts and putty. I think with the latest brickforge bits and some of the new mini figs it could be done with a more fresh look