Lapped zipper specs

Regarding the drafting specifications for the lapped zipper, all measures are made from the center back seam line (designated as CB). CB is the zero point. You'll add allowances from the zero point of CB.

Normally a garment has a CB seam allowance of 3/8" and this is no exception in the area that lies beneath the zipper inset area. So excepting the length of the zipper inset, the seam allowance is 3/8".

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