Cutting Line

The very edge of the pattern piece, where the fabric is cut.  This outermost line is beyond the seam-line (or sewing line) and the seam allowance.

Examples

Image 1

The Skirt Front & Skirt Back are shown at the top with seam allowance added.

Below is a copy of the Skirt Back & Skirt Front with the Cutting Line & Sewing line highlighted; the green line indicates the Cutting Line and the pink dashed line indicates the Seam Line ( or Stitching Line / Sewing Line).

Note: The Seam Allowance is the portion between the Stitching Line and the Cutting Line.