Aliens Reloaded has coding to make aliens automatically disguise themselves while traveling, which you can disable by clicking on them and choosing "Forego Disguise."
Nothing else in the mod should have anything to do with outfits. I play with AR in always and am not experiencing this either. Do you still experience it if you remove all your mods except for AR?
Alright, I think I found the issue - it's part of the autonomous sleep coding. You can get around it either by disabling Visible Brainpower or sending your sim to sleep manually.
Unfortunately the bit of code that's acting up is load-bearing, so I'm going to need time to poke at it. I should be able to roll out a fix this weekend, alongside some other minor bug fixes.
Edit: okay, update is live.
