June 2019
@crinrictHi there. I, too, have had this glitch since this morning. I had tried my game without any mods, purely vanilla and I still had this issue so I decided to follow your instructions.
I reset my files as described and tested with a brand new game. The Sim there, took from the gallery, worked fine without changing her clothes into a bathing suit.
When I tried again, putting back in the save that gave me the issue (again, vanilla with no mods. Nothing but the restarted folder and the save game) I have the same problem again with her changing into swimwear.
She's a human sim, not an occult. I've removed all laundry items from the lot and she's still doing it. What should I do?