So, being a purist, I prefer that my sims stay naked after they shower. There's a towel right there in the cabinet that they can put on. Yes, I even make them do a shower routine and get frustrated when they skip a step because they're sims.

This being said, EA seems to have finally "fixed" the bug where my sims were staying naked after a shower. Does anyone know where I can find a mod that restores this purist preference?

I'm assuming you mean in their towel outfit, because I don't think I've ever seen Sims wander around nude from a bug.
Zero has an Always-Towel mod.