Hi! My apologies for the delay ~ I just saw this now. I bought this at Joann Fabrics. Sadly, I have not been able to find it since.
The directions say to use stretch fabric only, but I see you used a cotton, which is what I want to use because of my considerable ongoing love affair with all those cute cotton prints and I wonder if you thought it was hard to use with that type of fabric or if you did not see a difference. Thanks!
The 5% spandex helped me turn this skirt into a pull on garment. Without that 5%, I would have instead just put a zipper in one of the side seams (which is what I ended up doing for another one of these skirts, with that fabric being linen). Honestly, I think I could have put a zipper in this fabric as well, and it would have been fine. Hope that helps. :o)