I love vintage table cloths, but this one my mother gave me really didn't match any of the colors in the house, especially in the dining room. So I pulled out an old cotton mattress cover I had been saving, and used it for the backing. It was already lined with batting, so I simply pinned right sides together and seamed it. I top stitched around the edges, but did not quilt the top.
It adds a nice little cushioning for a summer lunchtime picnic!