I was born in 1936 so the feed sack era was in big time. My Dad always bought at least 2 sometimes 3 feed sacks, that contained animal feed, that matched so we could use different patterns to make a garment. I wore many feed sack dresses and skirts with purchased simple blouses. She also made bed sheets out of the white ones(after she bleached them). It took 4 feed sacks per sheet. My Mother also cut her patterns out of newspaper and fitted them to us. I don't remember flour sacks being printed. It was a way of life and we were grateful.