I used a single 15 foot length of black 1.4mm braided nylon string to wrap the boot knife handle.
I started with a 3 lead 5 bight turks head knot with three passes. I then ran the cord up to the end of the handle and through the lanyard hole, back down to the turks head knot, where I worked it over/under one of the bights, and then started wrapping the cord around the handle. I went under the cords running up the handle for a turn, then over the cords, alternating the wrap towards the end. I made another 3 lead 5 bight turks head knot over the handle's lanyard hole to finish the wrap.