To demonstrate, the black cord represent the main “cord”, and the green and orange cord represent the smaller “cords”.  I have pinned these to a padded board, which I find makes this process easier to do.

 

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Step 1. Cross the two black cords, right over left, as shown.

Step 2. Pull the orange cord over the black cord and to the right.   Step 3. Pull the green cord over the orange cord, and place it off to the left.

Step 4. Bring the orange cord under the right black cord, over the black cord, and under itself—as shown in the arrows.

Step 5. Pull this knot closed, and push it tightly up.

Step 6. Now, take the green cord, pull it  to the left, and lay it over the black cord. Pull it up, and push it under the black cord, then off to the right. Last, direct it under the orange cord.

Pull this knot closed, and push it tightly up.

Step 7. To begin the next unit, cross the two black cords, right over the left, as shown.

Step 8. Pull these cords together and tighten as shown.

Step 9. Repeat the pattern outlined above. This is shown in the eight photos below.

Step 10. When you get to the end of the belt, pin the end, and stitch it to tie it off. And you’re done!