The complete tutorial is in the attached PDF file. Wait a minute! The pdf won't attach! I'm working on it--tech from this site is helping me--be patient! You can visit the original blog post tutorial here:
Pleat your fabric according to the diagram.
Sew one side of the pleats down.
Flip the pleats over and pin.
Sew down the pinned side.
Add a strip of fabric to each side of the pleats.
Fold in half and add a zipper to the matched edges.