If you piece the backing try to make sure the seam goes horizontally, less stress on the seam when pulling the quilt up. Also you could use three pieces of fabric sewing them horizontally and it will be wider than 88 inches. Large piece in the middle and cut off excess on each side. I hope this helps. I think there was an earlier post about pieced backings a few days ago. Go up to SEARCH and put in pieced backings.