Lay the jacket flat on even surface. 

Measure across the shoulder line from the shoulder seam to shoulder 

 

 

Measure across the chest from arm pit to arm pit.

 

Measure across the narrowest point of the waist line from side to side.

 

Measure alongside the center back seam from bottom of the collar to the hem.

 

Measure from the highest point of the sleeve to the bottom of the sleeve.