I did make some modifications — namely I made the skirt a half circle skirt rather than a gathered rectangle. My fabric is a heavier weight than the sheet used in the tutorial and I didn’t want a bunch of bulk at the waist.
Thank you for linking the tutorial! I ended up making one last night. Easy concept, but wow, did the gathers take long time (I used clips instead of pins, to save my hands from wounds ), and I had forgotten how to install a zipper but it’s attached! I had an old bedsheet, and a vintage zipper from the 70s already on hand, so a $0 project! 🩷