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Outer body fabrics, 11cm by 15.2cm are 2 pieces. (Seam allowances are included, attach interfacing)
Inner body fabrics, 11cm by 15.2cm are 2 pieces. (Seam allowances are included)
12cm zipper.
Fold the both ends of zip tape, and sew.
Sew the outer fabric and zipper with right side together.
Then sew the outer and inner with right side together.
Fold the fabrics, and iron. Then stitch the edge.
Sew the other side of zipper, do the same way.
Lay the fabric with right side, and sew around. (Leaving 5cm open for turning.)
Cut off extra cloths, and press seam allowances open.
Turn inside out, and sew the edge. It's done.