#4. Now run a long basting stitch along the top edge of the to-be-gathered piece of your skirt. Using this stitch gather your fabric until it is the same width as the top piece of your skirt.
#5. Now place the top and bottom pieces of your skirt right sides together and pin together. (You are pinning along the edge that you just gathered and pinning it to the top piece of your skirt.)
#6. Then stitch those two pieces together along the entire width of your skirt.