Make pleats, pin, and baste front
I marked the pleat locations on the old piping and then used that to mark pleat the locations on the new set back and front.First marking on the front piece (the longer piece), it's17.5" to first pleat20.5" to second pleat28.5" to centerThe piping ends right at the fabric end
The back cushions will be sewn shut and won't have zippers.
** Start from the center of the upper back and work out. There may be little excess piping at the ends to cut off, but we have plenty. **
Baste the piping to the front.Pin the back to the front and sew permanent seam.
Use the hot knife to cut snips all around the curved edges, through all layers (piping and front).
Sew back to front
On the back piece (the shorter piece) use the hot make little snips along the curved edge.Pin the back to the front, making pleats to match the front.Sew with permanent seam.
Make box
To make the box at bottom fold the bottom of the front (the long piece) and stitch, leaving 1/2" open at the end.
Fold under the bottom edge of the back (the short piece) in 1/2" and press.Turn the cover right-side out and press