Lay out both drapery panels and press the long edge of each panel in 2 inches, then turn under 1 inch. Stitch close to the fold, 00about 1 inch from the outside edge.
When you've stitched both long edges of each panel, evenly space your pressed tabs across the short edge. Our panel was about 50 inches wide, and our tabs were 5 inches apart. Pin the tabs into place on the front side of the fabric, raw edges up and right sides together with the panel. Then, pin the facing piece in place on top of the tabs and the panel, raw edges up. Pin between the tabs, then stitch a half-inch seam all the way across.