Aut cum scuto aut in scuto
My inexpensive ugly as heck handwarmer solution was a cast off windbreaker sleeve with loops taped onto back. It had no insulation and its only job was to keep my hands dry as I trudged along. Handy place to stash a small mini Mag Lite flashlight though (this was before headlamps) too. I suppose it would be good to layer with fleece on both sides, one for warmth, the other side for stealth.