@laylaplayer49Lol. This happens if you use CC, the game updates, and you load and save the game while your mods/cc are disabled.
Unfortunately the ONLY way to fix it is to re-outfit everyone manually. You can do this by opening up the household manager from the neighborhood screen and opening each household in CAS one-by-one.
It's a pain in the rear, but it's the only way. Remember, when the game updates, DO NOT SAVE your game until you re-enable mods!
If you're waiting for mods to update, then create a NEW SAVE and play in there until your mods are updated. Stay AWAY from your good worlds as long as mods are off.