Velour is the most commonly used fabric for main draperies. Cotton velour is available in a variety of weights.
Synthetic velours offer a few advantages over cotton.
Most are inherently or permanently flame retardant. And, typically, they are a less expensive fabric. Weights for synthetics are 15oz., 22oz., and 26oz. Usages are typically the same as cotton velour. You should avoid mixing and matching weights on the Main Drape and Main Valance as sometimes dye lots can have slight variances, and you may not get an exact color match.