Hopefully I'll have time to experiment with a waterproofing technique I read about. If all goes well, I'll have a beanie that water should bead up and roll off of. I don't particularly need a waterproof beanie, but it's small enough for a quick test and old enough I don't mind if it gets ruined. If the test is successful, I'll commit to using the technique on a canvas drop cloth and replace my plastic camping tarp with it.