Forbid to wear any accessories/hats/glasses for townies

I sympathize, but I use MCCC and hope you find the help you're looking for with those suggestions above. I do think the completely random crazy outfits are a pain. If they could just come up with a "vanilla" wardrobe of boring basics and then just...no hats or accessories...and let townies be like that, and leave it up to us to dress them up crazy if we want, that would be good.

Hi there! EG Warhammer's MCCC Dresser Tips are probably what you're looking for.

The top of the thread explains how to control premade outfit so that might not be relevant. Use Ctrl+F to navigate down to "Whitelist/Blacklist" section where it explains how to ban certain accessories from being selected as premade outfits. It applies to everyone (including your active sims). But you could enter CAS and give them the accessory after. A little more work but at least townies are not spawning with eye ball rings.

Edited to add link lol.. silly me!

https://www.patreon.com/posts/mccc-dresser-1-25959692

As far as I know, the only Mod that does that is MCCC. You can ask for help here:
https://deaderpool-mccc.com/#/help/faq
https://discordapp.com/invite/AUJ8RAa
https://forums.thesims.com/en_US/discussion/913483/mc-command-center-local-help-chat-thread#latest

The random NPCs popping up in my stone age-themed game is unbelievably infuriating. So definitely following this thread.

I agree. I go to the trouble of dressing all the NPC townies because the outfits are ugly and what happens, they redress them.