Seen so many of these found online. Finally got one in a old heavily trashed site that I almost didn't go back to. I guess it's a coat weight it's rather heavy and large . It has a #4 on it
It wasn't used in coats as much as it was the bottom of a woman's dress. They were sewn into pockets in the bottom of dresses to help them from blowing up from high winds. Those are always a neat relic find.