The gauzy fabric is from my Fabric Recycles stash, so I wasn't certain of its content. I think it's rayon or mostly rayon based on a burn test. It feels decent but has minimal breathability issues, so I assume there's some synthetic material in there.
It frays a lot. When I washed it the first time after wearing, I actually had to repair the waistband seam. I trimmed the seam allowance too close, and it came apart in the wash.