very good deducing
For all of you that say you want a poncho then I can recommend Hollywood Prophttp://hollywoodprop.com/spaghettiponchos.htmnot cheap, but authentic especially after you get the Almeria sun and dust on it.
I've seen a documentary about the making of '3:10 to Yuma' and they spoke of hundreds of identical costumes for every charakter but that didn't yield to a better film...