I'm overseas. Masks mandatory for all since we went back to school in October - there are about 3 students with exemptions who wear visors instead.
Dd2 is deaf, so her teachers swap to a clear mask or visor for her lessons.
It's all worked fine. Our PTA raised money to give everyone a school logo'd mask. Obviously these are social death above year 8, so we have bags of spare ones to give out...
I usually buy packets of cotton masks & have at least 3 in my bag at any time, so I can change mine at lunchtime & have a spare in case the elastic breaks. They go through the wash & I keep a big jar of clean ones by the door so dc & I can grab fresh ones every day as we head out in the morning.