How To Finish A Bias-Faced Neckline Edge At The Zipper Opening
A bias faced neckline finish uses a bias-cut fabric strip to enclose the neck's raw edge similar to a conventional shaped facing. When sewing a bias facing to a neckline with a zipper opening, the bias facing ends have to be treated separately to enclose the raw edges at each zipper opening portion. In this instance, you can use a simple folding and hand stitching technique to permanently seal these open fabric ends.
Once the bias facing is stitched and folded along the neckline edge, turn the excess bias facing ends inward to enclose their raw edges. As a result, each vertical folded edge should align on top of the zipper tape, next to the zipper teeth, without completely obstructing them. To secure, pin the folded layer in this position, inserting the pins perpendicular to the neckline edge as shown above.
Using a slipstitch, connect the facing's folded edge to the zipper tape underneath. Once applied, the stitch should not be visible along the zipper tape or the garment's face side.
Once the zipper area is secured, the rest of the bias facing can be blindstitched in the same manner to fully seal and complete the bias-faced neckline finish.