Sims jump in the water fully clothed

Is it all the Sims ? What traits do the have ?

It’s both Sims in my household but also Sims that I invite to “swim with…” Not 100% just randomly happens.  What traits would I be looking for? PS I’m not asking them to skinny dip 

Thought there was one where they are not naked but I think that uses the swimming outfit under the shower so not what you are describing.

Do they just not change into the swimming outfit or do the change into the wrong one ?

They don’t change into anything. If they are wearing their everyday outfit or summer outfit or work outfit, they just climb into the water wearing that. Next time it happens I’ll snap a photo. But it’s inconsistent. Some Sims will change into swimsuits, others don’t. 

Does it work if you change manually or do they change back then ?

I will try that and let you know, but as I mentioned earlier, it frequently happens with Sims I am not actively playing. For example townies or created Sims from other households who are at my active Sim home and are invited to “swim with” In those cases there is no option for me to manually change them into bathing outfits. They should do it automatically, as they used to do. 

I've been unable to duplicate this in my game. Everyone is changing into swimwear fine for me. I know you said it was hit and miss but I've tried a few now.

I would be very surprised if it was a console only issue.

Hopefully others can chime in if they see the same.