1.

Cut 1 piece for the back and 2 pieces for the waistcoat front.

 

2.

Sew back and front together at the shoulders.

 

3.

Cut 8 ties, each 50 cm long. Sew them to the sides of both the back and fronts 1 cm down from the sleeve gap and 12 cm from the bottom edge of the waistcoat.