Sizes stated below are- Uk listed fits.
Small = 37-39" chest (20-21" pit to pit measure).
Medium = 39-40" Chest (22").
Large = 40-42" Chest (23").
X-Large = 42-44" Chest (24").
2XL = 44-46" Chest (25").
3XL = 46-48" Chest (26").
4XL = 48-50" Chest (27")
