Hello, Hosta; I believe what you have are' pillowcase feedsacks'. I recall the days that we used to sew those up for our pillowcases; if we were lucky, Dad brought home a matched pair. If fact, I still keep one in the closet just for old times sake. The all-over patterned ones went into aprons, dresses, and a drindle skirt for a 4-H project.
Verna2197---you ask what is a feedsack. In the 1930's, certain brands of cattle feed/supplements (forgot what really was in them) were sold in those patterned cloth sacks. So the farmer's wife got a bonus yard of fabric every time hubby bought feed at the local grain elevator. I think flour also came in patterned sacks. Of course, those were the days that every housewife baked her own bread, and bought flour in 100# bags. Sugar and salt were also packed in cloth bags. These had dark blue printing on them, therefore they had to be bleached well before being ready to use. I still have a couple of quilts embroidered on sugar/salt sacks. Some of the printing still shows through slightly. There were several methods of getting the print out; some more successful than others. Frugality was the norm in those days of the Great Depression.