BUST:
Measure the fullest part of your bust. Don't follow your bra size. Follow circumference of your whole bust - all the way around. Jacket sizes correspond to your bust or Belly whichever is bigger.

                                                                  Size in Inches                      Scale in Inches
                                                                  -------------------------------------------------------
                                                                   XS   -     36(inch - Circumference of Bust)                        
                                                                   S      -    36 (inch - Circumference of Bust) 
                                                                   M      -   38 (inch - Circumference of Bust)
                                                                   L       -    40 (inch - Circumference of Bust) 
                                                                   XL     -   42 (inch - Circumference of Bust)
                                                                   2XL   -  44 (inch - Circumference of Bust)
                                                                   3XL   - 46 (inch - Circumference of Bust)