[NRAAS] How to keep NPCs from having their wardrobe changed indiscriminately?

You could just do what I do. I spend anywhere up to an hour for each sim day I play on giving makeovers to all birthday sims in my town. In your case it wouldn't be too bad since you play on Epic but, let me tell you, on a short lifespan it can be a nightmare! :# but well worth it because even if you blacklist stuff, you still might end up with combinations that don't look the best.