So I figured I'd try to copy it. The skirt of this version is a very thin cotton jersey. It's a little too thin and maybe too static-producing to be suitable for tennis, but I'll give it a shot. The skort is likewise too thin but it's 4-way stretch so it could in theory work.
I will shorten the waistband by 7 inches next time, and I was thinking I'd add a few inches in length. Maybe, maybe not.