Transfer the marking for the decorative ribbon to the right side of the fabric with basting thread. Fold the decorative ribbon 1 cm at the lower end and pin it from the right to the front neckline. Pay attention to the marking. Topstitch close to the edges on the lengthwise sides and the lower cross edge from the right side.
Pin the front piece right sides together to the back piece. Close the shoulder seams, finish the seam allowances together with a zigzag stitch, and press backward.
Place the front and back pieces right sides together and close the side seams up to 1 cm before the end. Leave the last centimeter of the side seams open. Finish the seam allowances together with a zigzag stitch. Note: the back piece is about 10 cm longer than the front piece.
Pin the front hem facing right sides together to the back facing and close the side seams. Leave 1 cm open at the top end.
First, pin the back hem facing right sides together to the back piece. Stitch the lengthwise and crosswise edges of the hem, making sure the seam allowances of the side seams point forward. They must not be sewn in. Now stitch the front facing to the front hem. This time the seam allowances of the side seams point backward and must not be caught in.
Place the front and back neckline facings right sides together. Close the shoulder seams, finish the seam allowances together with a zigzag stitch, and press forward. Finish the lower facing edge with a zigzag stitch.
Pin the facing right sides together to the neckline and topstitch. Finish the seam allowances together with a zigzag stitch.
Carefully cut the seam allowance in the curves with a pointed pair of scissors.
Also cut the seam allowances at the V-neck in the center back.