I think we ought to find or come up with a design, sewing pattern.
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How hard can it be to hem a rectangle and attach thin elastic on each end to fit over the ears??
They say the masks that don’t sit right up against your lips but instead have an air gap, are better. Air gaps around the side are no good either. I don’t even wear the fiber one pc dust masks because none of them fit my narrow face. Take the mask off and there’s a stripe of dust leading right to each nostril. I buy the dust masks that have a silicone face part and replaceable filters. I can get those in S, M, L. Medium is what fits me. Same with spray painting masks. I’m going to the welding supply store today/tom to get a new dust mask and replacement filters because I can’t find any replacement filters for the one I have.
So yeah, a rectangle would not do very well. Even surgical masks have a pleat sewn in so they wrap around a face better. Surgical masks are to protect the patient, not the surgeon. Nothing more than a drool catcher really. Can’t be drooling on someone’s innards.