The broadcloth I've seen is part polyester. That doesn't mean you can't use it but there are a few things to consider. It will react differently than cotton fabric so if you mix the 2 fabrics, some will fade and some won't. They also will iron differently so watch for that. I have made children's quilts out of all broadcloth and they really wear well. If a fabric has polyester in it, it is harder to do needle turn appliqué with as it tends to spring back when you try to turn it under.