Lining material needs to be 6-8 inches longer and wider than your quilt top. I will return all fabric and batting sent to me.
If piecing your backing (lining) material I recommend that you have the seams down the length of the quilt top. This allows me to load the backing where I am rolling with the grain of the fabric thus causing less shrinkage. This is not required but I do find that the results are much better. I don’t mind the selvage being on the sides of the back but don’t use them in the seams. They will cause the back to not lay flat. If you do use them cut about every 2 inches to ease up on the stress.
I do not recommend that you open the seams on the backing material. This weakens your seams and could come apart over time. For best results iron all seams flat to one side.
Other than light pressing, your quilts are done in the condition that I receive them in. So for best results I recommend that you clip all loose threads and press your quilt top and backing material with seams laying flat.