It seems to be secured by the goggles. You’d need some way of clamping or otherwise fastening the goggles to the fabric, and the fabric would need a finished edge that could take the tension without tearing or pulling loose. I’m thinking you might need to turn the upper edge of the fabric in and run something through the channel (i.e., around the back of the head) that would attach to the inner side of the goggle earpieces. It might take some trial and error to figure out how to do that—especially with fabric that’s stretchy enough to move in.