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I found a few links on making "ninja" masks out of t-shirts. They seem as good as any. The best thing is you can just throw them in the washing machine after an outing. https://www.wikihow.com/Make-a-Ninja-Mask http://www.funlol.com/1255/Ninja_Instructions!.html

“Origami” tea cloth mask with rubber bands https://www.instagram.com/p/B96rcR8neYv/

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There was a paper that went by my Twitter feed yesterday about how dish towels tended to do better on the particulates the researchers were testing on than a t-shirt (or piece of silk, or double layer cotton shirt, or...). I agree about them being better than nothing and it'll be fairly dependent on aerosol size but you should probably prefer thicker clothes.

This website chose cotton t-shirts as the best combo

https://smartairfilters.com/en/blog/diy-homemade-mask-protec...

https://smartairfilters.com/en/blog/best-materials-make-diy-...

Dish towels and vacuum bags do a better job of filtering, but make breathing quite difficult. A simple cotton t-shirt material is fine. And there's no sign that double layers help; and they make it harder to breath as well.

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