Tag says it is a 40R but it measures a 44. 

Mannequin is a size 38 chest.
This is a light weight jacket.

LINING (Full or Partial): full
Rear vents: 1

Measurements
Chest: (Across chest armpit to armpit, doubled): 44"
Overall Length:31"
Sleeves (From outer edge of shoulder to outer cuff of sleeve): 24.5"
Shoulders (Across top of Shoulders): 18"