First run parallel threads through the fabric to gather it. The stitches need to be lined up & evenly spaced. It's easy on this fabric.Then stitch the pleats to a stabilizer strip (or waistband). Take a stitch at the fold of each pleat.
Here I set the skirt to the bodice. The pleated section had to be sewn by hand
|Pelisse back showing belt over waist seam.|