Cloud Dreamer did that in a couple of his fics, but the only one I can recall off-hand is the one where Skuld locks him in female form and she eventually winds up with a bracelet that repairs and improves any clothing the person is wearing to be top quality. Except that it only does female clothes because Ranma is currently female (or possibly only does female clothes, she's still locked at this point and I don't know if they addressed it when he finally was ale to change back). Only trouble is that it was really girly clothes. Anything she wore while wearing the bracelet got turned super girly, but high quality.
Oh, and the person who gave it to her forgot to tell her the password to remove it, so Ranma was stuck with it for several days.
http://clouddreamer.com/
Oh, and as for the original request, I believe this qualifies:
https://www.fanfiction.net/s/434003/1/P ... f-the-Moon
Princess of the Moon reviews
Permanently cursed to be a girl at Jusenkyo, Ranma does't take it very well and sets off on her own after punishing Genma. This story has a lot of twists and turns, so one can never be sure exactly what will happen as Ranma influences everyone.
Crossover - Sailor Moon & Ranma - Rated: K+ - English - Adventure/Humor - Chapters: 17 - Words: 243,571 - Reviews: 306 - Favs: 418 - Follows: 359 - Updated: Jan 20, 2007 - Published: Oct 18, 2001
I recall another one where Ranma got the mantle of Serenity, and the body. IIRC before it was abandoned she wound up on the Moon where she could do simulations on how to uplift society with the help of an AI (the same hologram that greets the Sailor Senshi in that one episode where we get the exposition on the Moon Kingdom). Everything she did wound up in failure. Then, getting tired, she decides on a whim to try one thing just for the heck of it, not trying to be serious and sets the simulation to create a religion on her being a god. It succeeds.