Given that I live in Oregon, lots of folks I know have been making masks with bias-tape ties. These have the advantage that they don't require elastic (still in short supply), aren't head-size specific, wash better, and are more secure for long use.
However, the ties are super-awkward to tie behind your head, particularly if you have long hair.
Since I have long hair, I decided to create a 3D printable design for a "hook clasp" that could be easily threaded onto bias tape ties and easily fastened, and even tightened. It took me a bunch of tries, but I did it.
Please make use of my hook clasp design on Thingiverse, and 3D print some of your own. If you have a 3D printer, consider printing several dozen (it takes 4 per mask) and sharing them out with your friends who have masks that tie. The easier and more comfortable we can make wearing masks, the more people who will wear them.