There are multiple issues going on and this is likely either a duplicate or by design.
I'm going to lock this thread now as dupe. Please use the threads linked below.
- If your NPC is wearing an outfit they don't have, it's a situational outfit and it's by design. There used to be a bug where they don't change out of them but I don't know if that was ever fixed or not. You can spot those by checking the Sim. If they don't have the outfit they are wearing, it's a situational one.
- If your NPC is wearing a random cold/warm weather outfit you didn't assign, please use this thread: NPC Sims wear random cold/hot weather outfits not assigned | EA Forums - 11972425
- If you're active Sim has added a random outfit to their wardrobe, please use this thread: Played Sim creates new outfits | EA Forums - 11879522
Create a new thread if none of these apply to you.
