Sims wear default underwear/AA shorts when naked

Sims are showering while wearing the knee-length shorts from the Adventure Awaits EP.  I've played in existing saves and created a new save and all sims, male and female are wearing the same shorts while showering. I don't use mods or cc in my game, although I did add a smaller mosiac mod to my game so I could see which shorts sims were wearing. This only occurs on sims from housholds unplayed before the Adventure Awaits EP, suggesting that sims bathing outfits are being genrated with the shorts.