Supposedly the Zebralight was shipped, so I may see it in several days. I've already got a good head strap idea, and that material is on hand and ready to go (0.22 ounces). No buckle or slide. I think there is some kind of a mounting device where the flashlight mounts to the head strap. I have two or three different substitute materials for that.
While backpacking, I wear a baseball cap during the day, then a 1-ounce watch cap during the evening, and nothing while inside my shelter. It is best if the new light can be supported on my head without the need for any cap.