Circumstances:Pretty simple, I ended up capturing a tribal during a raid attempt and recruited him. Looking at his stats I saw that he was a nudist and immediately stripped him since it gives a 20 bonus to happiness, but upon stripping him he re-equipped his tribal wear. I figured maybe it was just the tribal wear since he spawned on map with it but I put him to work at the tailoring bench and upon making clothes he will put them on even though he has the nudist trait.
Expected outcome: upon stripping, nudist shouldn'the put clothes back on.
I don't think it's a bug, so much. I think you just have to set the right "outfit" for him. And changing the default outfit for nudists would be a bad idea because cold map = death.