[Symmetry]

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.

[skipwalker]

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-...

[greedo]

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.