Step 5: Pin the Perimeter of Fabric and Sew
Starting at one end of the zipper, measure about 2 inches from the edge and pin along the perimeter of both pieces of fabric, making sure the pins are aligned. Sew along the edges, following the pin marks so that there is a 1 1/2 to 2-inch space along the entire perimeter. Once finished, trim the excess with fabric scissors so there is only 1/2-inch excess along the perimeter.