Neck can be stitched by giving piping or bias facing or shaped facing
As soon as the fabric is cut stay stitching should be done at the curved edges of neck and arm hole. This prevents the neck and armhole from losing their shape while handling.
Piping is suitable for neck designs with wide curves.Neck designs with narrow curves are not that suitable.
Cut Bias binding four times the width of the finished binding .Press the seam allowances of ¼” on the longer edges of the binding. Stitch the bias strip to the neck keeping right sides together and having a seam allowance of ¼”. Turn the bias binding over the raw edge to wrong side and hem in the line of the machine stitch. If you want to machine stitch, turn the bias binding over the raw edge to the wrong side such that the binding just covers the machine stitch and tack. Machine stitch from the right side. Stitch in the seam joint of the neck and bias binding.