When I found a very simple skirt at the thrift store that I liked, I decided to try my hand at making my own. I'm very happy with the result. I've made 4 now, and I'll probably make more. This first one is made from a thrift store sheet.
The best part of the skirt (and I think what made it easier) was that the skirt is lined in a way that encloses the elastic. Not having to make a casing was an advantage to me. Also makes the skirt super comfy. You basically make 2 skirts, join them at the waist and sew a casing an inch below and slip in the elastic. I like using broadcloth for the lining.
So, following this tutorial, I laid out my original skirt and traced it onto brown kraft paper to make my pattern. I marked the side that goes on the fold.
Making the pattern almost takes longer than making the skirts. If you want to try this idea, I'd recommend finding a pretty simple design. I'd guess that zippers and darts would have made this much more challenging.
Here are some other fun skirt tutorials that I found that may be helpful:
Makeit-Loveit elastic band skirt
Easy Peasy skirt by Everything Etsy
Any questions, please let me know. I couldn't find the exact tutorial that I used (man, I hate when that happens!!)