This concept drives me nuts, but I wear a much different mask from most.
Mine is a silicon mask from http://gir.co
It clings to the skin, giving a tight seal. If I get any fogging, I just press the mask and it stays. It doesn’t slip. Even running my dogs at a dog show.
They also sell a liner made out of material similar to that used to make N95. The nice part of the liner is that it can go in any mask. I have gone to a few places that didn’t like the silicon (my cornea doctor) so I wore a fabric mask with the liner in it.
I do keep a fabric mask in the car, so I guess I’ll go through the motions.
I’ve been vaccinated without knowing and have managed to NOT get infected. I’ve only know for about a month and I haven’t changed the way I do things indoors. I’m a bit more relaxed outside, depending on who I am with.
By the way, if you want to double mask without any bulk, those liners from GIR.co are really great.