I have made drapes that go wall to wall out of quilting weight fabric. by the time you line them and pinch pleat fullness they are beautiful. They go to the dry cleaners well and return beautiful. When they are 15 feet wide, you don't want fabric that is too heavy. Mine have been up 30 years and they are still gorgeous. Of course, custom made drapes are always gorgeous in my opinion. I remember when they were required to be sold with the house if you put the house on the market......those days are long gone with "curtains"