After cutting out your Back Yoke Style #3 Main and lining fabrics (make sure that you have a right and left side of each), apply your interfacing (if using) to the back of the main panels 1/2" in from edge.Place your main fabric and lining right sides together. Make sure you still have a left and right side.
Pin and sew along the armholes with a 1/2" seam allowance, stopping a 1/2" from the edge on the shoulder.
Pin and sew along the neckline and down center back with a 1/2" seam allowance, starting a 1/2" from the shoulder edge.
Clip your curves and cut a 45 degree angle along the Center back corner making sure not to not clip through your stitching.
Turn both sides right side out and press well. Edge-stitch 1/8" down your center back edge then sew a line down your center back edge 1 3/8" away from the edge on both sides of your Back Yoke.
For your buttonholes, I used my button hole foot for my sewing machine. If you don't have one refer to the glossary to see how to make button holes with out an sewing machine foot. Make sure to mark your button holes using the guidelines on the Back Yoke Style #3 pattern piece and sew your 3 buttonholes on the left side of your back yoke.
After finishing your buttonholes, cut them open and lay your left back yoke piece on top of (it overlaps your right back yoke) aligning the left center back along the right inside line (1 3/8" in from edge) pin at bottom and baste the overlap with a 3/8" seam allowance,
Place your back yoke right sides together with your back bodice along the top edge, pin, and then sew with a 1/2" seam allowance. Finish your raw edges. Press bodice seam allowance towards bodice. Optional: top stitch along the bodice edge.
This is how your back yoke will look when it is all finished!