Tack interlining to drapery at center and between center and side hems.
3″ TACK DOWN THROUGH CENTER INTERLINING FOLDED LENGTHWISE FOR TACKING 1½″
Turn and baste hems—side, top, and bottom.
UNDERSIDE OF MATERIAL INTERLINING
Fold interlining through lengthwise center. Place fold on exact center of drapery fabric and tack together loosely. Take a stitch in the drapery; bring needle up through fold of interlining and leave a loop. Space about 6″; take a stitch in drapery, then interlining, then drapery, etc. Do not pull thread taut. When row is finished, fold interlining halfway between center and edge on both sides and tack in the same manner, making three rows of vertical tacking.
Catch-stitch hems to interlining.
Turn side hems back over interlining. Pin and baste. Then turn top and bottom hems. Pin and baste. Miter hems at corners. All hems may be catch-stitched to the interlining, and the lining slip-stitched to top and side hems. Linings may also be joined by machine. Turn hem and baste; then pin lining to drapery and stitch, taking ½″ seam. Press seam as stitched. Then clip and press seam open the same as for all lined curtains and draperies.