Misnomer, you totally have the right idea. The very best solution to how to preserve your skirt from dirt and wrinkles is simply to take it off and hang it up on the hook while you do your business.
When I wear a dress, it’s a choice between hiking up the skirt or just taking the whole thing off and hanging it up. Why not put it out of the way? Unless it’s one of those Ren-Fair numbers that you need a lady-in-waiting to lace up for you. That stays on. (As for modern-style dresses, I’m so glad that thanks to my yoga practice, I can reach behind my back and zip up my own dress with no one’s help.)
Paul Theroux’s novel Millroy the Magician told the story of a health-food advocate who hosted a kids’ TV show. He got kids from the ghetto on the show and had them tell the audience about healthy eating and the importance of regular going to the bathroom. They advocated a natural approach to bathroom habits. Eventually one of the kids said on the air: “When you go to the bathroom, just be naked!” That got the show instantly cancelled, of course. But it seemed like plain common sense to me.