Hi I just saw the picture of your christmas tree skirt. It is realy great and I would have loved to wear it for a square dance skirt. That is beside the point, Take your lenght of fabric and unfold it, then fold it in half along the selvage edge. Then draw a quarter circle on the folded edge, and another one on the oppisite corner, when cut out you have one half circle and two half circles and when sewn together will make a circle to use for your lining. Of course be sure to check for the correct size for your tree skirt. If you have any questions, Pm me and I will explain in mor detail. Trish b