I can verify that the polyviscose materials are available in the Salt Lake Joann's. I picked up some Royal Stewart. They also had Stewart Black, and Blackwatch. It appears to be about 11 oz or maybe just a bit lighter. In my opinion it should be ok to make a kilt with since I have done this sort of lightweight stuff before. A liner in the apron may or may not be necessary, we'll see. It's 45 inches so you will not be able to split it.
It's a good deal for someone who just wants to practice, or wants a knock around kilt though.
Good hunting!