1 For a lapped zipper, increase the zipper's side seam allowance to 3/4 inch wide. The placket laps from front to back. If there is a sleeve, mark the side seam 2V2 inches below the armhole edge for the top of the zipper opening. 2 Cut a piece of fusible web to the shape of the new side seam, 3/4 inch wide and the length of your zipper, plus 1 inch. Fuse it to the wrong side of the front body panel aligned to the left of the seamline at the zipper opening, and extending 1/2 inch beyond each opening end (not shown).This helps support the zipper, stabilizes the seam to prevent distortion when stitching, and gives a crisp folded edge. The fusible web is especially helpful if the side curve is deeper than 1/2 inch.
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