Frugal GM Quick Craft Tip: Scale Model Cloth
Water down some glue (slightly) and paint your fabric well with it. Adjust the cloth to your liking when wet and as it dries it will set up in your desired shape.
I recommend using lamination glue, but in a pinch you can easily just make a 50/50 mix standard white glue and water. Experiment using tissue paper laminated to paper or cardstock for strength.