Two pieces for the outer layer and two for the lining (typically cm for a small pouch).
Sandwich the zipper between the outer fabric (face down) and the lining fabric (face up). The zipper teeth should be facing the outer fabric. Adriana Rioszip
Pull the pouch through the opening in the lining, then stitch the opening closed. Push the lining into the pouch and press. Two pieces for the outer layer and two