Open up the LINING from the main garment. Fold the garment in half RIGHT SIDES TOGETHER.
Match the underarm point. Pin along the length from the bottom of the main garment fabric to the bottom the lining fabric.
Mark the ZIP END POINT on the LINING and the main garment.
Stitch from the hem of the main garment up until the ZIP END POINT. Backstitch to secure then change stitch length to a longer one. Continue stitching up until the underarm point. Secure and cut the threads. Change back to a smaller stitch size then begin stitching from the ZIP END POINT marking on the LINING and stitch until the LINING hem.
Notch the intersection at the underarm point.