In any case, the question the public should consider when wishing to wear a mask is, “What is your goal? Why do you want to wear a mask?” Because if the answer is,”So I don’t spread it to others”, then literally any fabric hanging over your face will suffice. Something to catch the virus laden droplets and aerosols you exhale. A bandana, a surgical mask, just about anything. Since most people are not that philanthropic as a priority if you want to protect yourself it must really be a “respirator”. Again which will be used outside it’s intended purpose. Sort of “off label”. The failure rate will be high.
Common sense, yet we are told not to. And even a t-shirt can reduce the viral load from another person.