I offer two options for my clients who want blackout lined silk drapery panels. Option 1 is interlining and blackout lining. Option 2 is the French blackout method, which consists of 4 layers of fabrics: the main fabric (silk), then interlining, then black lining (lining that is colored black), and then white (or ivory) lining. It adds nice weight and fullness to the silk and hangs beautifully. The photo below shows my drapery panel sample: the left side of the photo shows French blackout layers; the right side is Option 1 above (silk, interlining and blackout lining).