Twill is a pretty awesome fabric, but the color selection is limited. It's thick, durable, and I've used it with my costumes like Ordon Village Link's pants or some embellishments on Davy's jacket. It's heavy, but it should work. Cotton flows really well, but it might tear.
... That's pretty much the only advice I can give you. sorry. My cosplay are usually sculptural (I guess) rather than focusing on fabric and patterns.