To greet anyone with due social distancing, Indian namastey works better than any other way of social greeting. Seeing that this has universally been adapted. From Israel to Iran, from America to France, Indian way of greeting has become the new norm of socially greeting. Now international diplomatic meetings also begin with only Indian way of greeting.
Likewise traditional Indian gamchha around the neck covering full face except eyes in at least triple layers could also become functional for universal public masking around the world. After every single use the khadi cotton gamchha can be washed with soap and water and left to dry in sunlight for few hours. Thus this becomes really ready to reuse.
So peoples across all the countries may now unhesitatingly adapt Indian traditional countryside skarf along with traditional Indian way of socially greeting.