How To Sew A Zipper. Get it wrong and the whole room will know. Fold both pieces of fabric to one side of the zipper and press away from the zipper teeth.
Ie mark the length you want your zipper opening to be on the zipper. Sew a straight stitch along the edge of the zipper. Sew the three layers together getting as close to the zipper teeth as possible.
Keep the zipper teeth in the groove of the zipper foot foot to ensure that your zipper will be well hidden by the fabric.
Sew the zipper onto the outward flap by sewing the length of the basting line. In the edge mark 14 B up from the end of the stitch. Then press seams open. Now you will sew down one side of the zipper across the bottom and up the other side all the way to the top.