Twill is a good choice. That's what I've been using to make my friends cosplay. I've used a golden yellow cotton for the trim and I'm going to use shoulder pads (I lucked out and found someone that had the same shape) covered in the golden yellow cotton for the weird things at her shoulder.
"What is it one should be fighting for? War makes that question very difficult." ~ Lacus Clyne
"If you have the power to make a differance why not use it?" ~ Mwu La Fllaga