“The best homemade cloth masks actually achieved better filtration (79 percent) than surgical masks (62 percent to 65 percent) in a peer-reviewed study at the Wake Forest Institute of Regenerative Medicine published in April. In the study, the best cloth masks were made of heavyweight quilter’s cotton with a thread count of 180 or more. Masks with even thicker thread, tightly woven like a batik, and double-layer masks with a basic cotton outer and flannel inner also proved effective...
Single- and double-layer masks of lightweight, low-thread cotton were the least effective. The researchers also found that gaps at the edges of an ill-fitting mask can decrease filtration efficiency by 60
https://healthnewshub.org/health-news-hub/top-news/cloth-mask-vs-surgical-mask-vs-n95-how-effective-is-each/
My MIL is a quilter. Our masks are made with quilters fabric, which is better than the disposable mask.