Back when I got started in turkey hunting, there were no masks available. You kind of had to improvise. Most guys used face paint. I wear glasses, and anything that I tried made my glasses fog.
The method I adopted back around '84 and have kept to this day is kind of a veil. I take a camo boonie hat with the tabs going around. I tie on a piece of camo mesh to either temple. When I'm out walking, the mesh is back over my neck as a sunshade. When I'm sitting, I keep it piled up on top. When a gob starts coming in, I just have to tip my head down and the mesh falls over my face like a veil. If I have the time, I pull on the veil so the front clears the brim and I have just enough clearance to see over the top of the veil.
There are bonuses to this arrangement. The veil hides me well enough that I can reach up and change mouth calls without being seen. The veil is far enough away from my glasses that they don't fog.