My mother and grandmother made wool comforters during WWII out out of my grandfather's old wool suits. They were backed by flannel, not sure what was used for batting. These were the warmest bedding I ever sleep under. You were never cold. Back then you turned the heat off at night to save on cost and frequently woke up to frozen pipes in the kitchen and bath, but you stayed warm in your bed. If prices keep going up and unemployment stays high we may need warm bedding like that again.