I wonder how a mylar survival blanket would work? Held at least a foot away from the body, it should be at ambient temperature, and reflecting 90% the IR away from the camera.
ETA: Seems to work, but can’t be directly worn or it’ll be warm too. And you’ll bake, oh yes. FLIR making it into a jacket is just dumb, and I’m sure that they knew it wouldn’t work.
