We’ve been sewing masks for over a month using the freesewing.org pattern. Use old thick t-shirts and they are pretty effective at covering your breathing ports.
Getting elastic has been a problem. I’ll share my method: buy 1.5" or 2" wide elastic and slice it down the middle. It holds up well in the wash, tho I’d recommend hand washing, ironing and hanging out on a clothes line in full sunlight. Also fun to use parts of the graphics on the outside. Plus they are reversible (just use one side at a time until you wash it ok?)
