Played Sim creates new outfits

Every now and again my sim's change into clothing I didn't get them. Literally a new outfit I have never seen that I now have to delete from their saved outfits. It is always on zoning somewhere...sometimes going out, sometimes when they come home from work (not their work outfit, just something random they are wearing instead) or from school. On one occasion it was accompanied by my sim suddenly looking like (but not being labeled as) an elder and I had to use a mod to reset the sim which popped him back to normal looking. It doesn't seem limited to any one sim or household, but I have one half alien that has lost all the clothing assigned to his non-disguised appearance in favor of the base "alien outfits" they come with by default twice now. Unfortunately I don't know how to trigger it to narrow it down, its just that sometimes they get new random outfits out of the blue. I don't recall having this issue until the most recent patches so I'm throwing it out there.