Please see below for approximate measurements:

Vest Size XS - Fits 34-36" Chest S - Fits 36-38" Chest M- Fits 38-40" Chest L- Fits 40-42" Chest XL- Fits 42-44" Chest 2XL- Fits 44-45" Chest
Chest - Measured flat pit to pit 18" 19.5" 21" 22.5" 24" 25"
Back body length - Measured flat from high shoulder point to hem 27.5" 28.5" 29" 30" 31" 32"
Sleeve length - Measured from shoulder to end of cuff 7.5" 8" 8.5" 8.5" 9" 9.5"