Oh, that thinned out, worn bed sheet area. It's one area. Why does the rest of the sheet look fine?
Here are several tutorials on how to mend your sheets and make then last much longer. Why should you? if you're like me, you like all cotton sheets. Not the new ones that are scratchy and have a very low thread count. Or even the new Egyptian cotton ones that are made with so many chemicals, they don't have that fresh dried-in-the-sunshine smell. Oh, no siree! I mean those old Cannon, USA made sheets that can only be found in thrift stores.
So I do anything I can to extend the life of these thick and delicious babies once they start to thin out. Which by the way, takes me years to do. These old sheets last longer than any new ones I've bought in the last 20 years.
Mending a bed sheet
How to mend a bed sheet
Sheet mending day
Mending a bed sheet hole
My mother used to mend the small holes by simple darning the hole with the sewing machine. By this, I mean she sewed back and forth on the sewing machine in one direction completely covering the small hole, and then she sewed back and forth perpendicular to (across) the first stitching. This covered the hole completely and made a new fabric.