I added the stitching to an already tied Solomon bar/cobra stitch/Portuguese sinnet paracord bracelet with a 1/2" side release buckle, using about 4 feet or so of 1.4mm cord with a small Perma Lok lacing needle.
The book's diagrams show a single leather thong being worked through a series of holes in a piece of leather, that could be used to join multiple sections being sewed together, as edging, or added as decorative work.
The pattern is fairly simple with the strand coming from the top end of the bracelet at a slight right to left angle, down over three horizontal strands, back up under two to the right of the previous strand, and repeat. The start and end of the stairstep stitching cord was secured under a few knots of the underside of the bracelet.
The stitching could easily be varied with how many strands you work over/under and what type of paracord bracelet design it would be added to.
I also tied a navy blue paracord lanyard with orange 3/32" Tether Cord, stairstep stitched down one side and up the other, with one piece of cord. Shown attached to a Wenger Evo S13 Swiss Army Knife with a medium Flat Titanium Gate Clip.
medic alert tag, and two parallel lines of stairstep stitching along the length, done with black 0.9mm cord.