Well, I did it. I could hardly bear it, but I finally cut into my little collection of feedsack fabric!
Feedsack fabric is from the 1930s and 40s era, when flour, sugar, seeds, rice, fertilizer, and feed were packaged in brightly printed cloth bags. The prudent housewife would save these bags and make useful and beautiful things out of them, like dresses, quilts, and aprons. The sacks came in many different prints and colors, and ladies would save them up and even trade them to get just the right prints for just the right project.
If you look carefully, you can sometimes find feedsacks in thrift and antique shops. If you know what you're looking for, you can easily identify them by the look and feel of the fabric, and by the little holes along the edges where they were previously stitched into sacks.
And they're cute on the inside, too!