The center back piece and side back piece seams are extended at right angles just below the waist. The side back seam was sewn just past the extensions, which were then folded towards the sides and whipstitched to the lining, and then the rest of the seam was finished by hand.
Left: The center back seam was sewn without matching the stripes.
Right: The lining is pieced on the right side.
A few of the stitches that secure the collar binding show through to the lining.