Step 7 / Now continue the braid but only add new pieces of hair into the top side of the braid. (missysue.com)
Gently tug on each side of your braid simultaneously to create the illusion of thickness. (marieclaire.com)
Bonus variation: After step 5, keep taking hair from either side of the braid until you have no hair for this full side braid look. (withlovelilyrose.com)