Any other color is likely to be unacceptable. Chaps need to fit you. You probably cannot borrow chaps, unless they fit you perfectly. Chaps should be tight all the way down your leg, and fit high on your hip and thigh. They should hang 4-6 inches below your heel.
Men wear only black, beige, or rust.
Women may wear those colors, or any other tasteful color that matches their outfits. Men should wear double concho belts, while women must have single concho. No K-mart jeans are allowed. Womens pant must match the color of their chaps. Most of the betls in the tack stores are unacceptable.