I remember feed sacks rather than flour sacks, from boarding school days (4th-8th grade) because we girls would choose, among each shipment of feed for the animals/farm services, enough sacks to wash (after emptying of course), set the color (with vinegar?) starch and iron before laying dress patterns. One older girl made a more formal dress for a dance from such sources. Remember when patterns were not printed at all; you had to "read" round holes on each piece. Thanks for the memories from a 78 year old quilter. Recently, a contributor to this FB told of printed sacks she found in a grocery outlet in Idaho.