Materials and Tools:
1. Sew the lined flat topper panel with curves along the bottom. To make the goblet pleats, first determine where they will be placed. Pull the fabric together along the top edge where it corresponds to the upper portion of a bottom curve and decide how you like the look and positioning of the entire pleat (six to eight inches is plenty for a pleat).
2. Lightly mark where the pleat should be sewn along the top edge. Draw vertical stitch lines down four inches from the top edge of the topper. Pin the pleats along the stitching line, and sew them in place.
3. Shape the pleat by dividing each one into even pleats. This can be done by opening the pleat at the top of the heading and pinching the fabric into three or four folds near the base of the pleat. Make sure they are all even, and then tack them in place by hand or bar-tack the pleats by machine.
4. Form the tops into rounded goblet shapes, and then hand-stitch about 1/2 inch of the back edge to the topper on each side of the pleat stitch line to hold the goblet in place.
5. Hand-stitch cording along the front, and then staple or tack the topper to a fabric-covered 1x4 and use L-brackets to attach it to the wall. For even more support, insert tissue paper into the pleats. Just make sure to remove the tissue before cleaning.
6. For a third layer of softness, gather the fabric of side panels at two points at the top of each drape; put a rubber band around each point, and then use push pins to attach them to the top of the window frame.