Please note the one of the links is for a pattern for a personal use mask that includes an extra “filter” layer. Designed by a Taiwanese physician.
Also, the last link is an interesting read about what fabrics do or don’t and can and cannot offer protection. Bottom line is that plain cotton fabric, especially single layer cotton fabric, does basically nothing..and I have read elsewhere that can allow 97% of virus’ through.
This information may help...or may not...I find it hard to find 100% reliable answers. I hope in small way this can help make things a tiny bit easier if you are ready to start a mask making adventure.
Our medical professionals, our friends and families will appreciate our help nd our commitment to staying home, staying well and keeping the sunny side ip during these very surreal times.
Note the measurements (mm on left inches on the right). I did not have such a precise ruler and used half inch segments …which will work. Using the numbers in the image as an example: to pinch a tuck : pinch at numbers 6 and 4 matching the notches. Number 5 becomes the “peak” of the tuck.