I took a pair of swimming goggles, removed the rubber portion, wrapped the center in leather and wired it in place, then used the same wire to attach this strap made from a belt. I added two spare loops I had lying around so that the buckle side can be adjusted. While most of the goggles I've made can fit over glasses, these can fit under a lot of them, amusingly.
Thanks. I am having fun experimenting with different materials for goggles. I really want to find a pair of binoculars like I had as a kid, where you could take them apart and remove the lenses and all, and turn them into a pair.