I give up on trying to get good pictures.
I didn't use a pattern but you can. Just line up the bottom of your skirt pattern pieces with the bottom of the hemmed curtain.
When I attached the waistband to the gathered bottom piece I discovered that I had measured my waist too generously- or I lost four inches in two days- I wish! So, I ended up having to take in the waistband after the skirt was finished- but that isn't very tricky.
Since I had used the finished curtain edge as the skirt bottom there was no hemming involved--- gotta love that!
All done- not too bad for $5.99 and the cost of zipper and thread!