Size marked L. Fits close to a 42R based on measurements.
100% Cotton
Measurements:
Chest: 21.25" (armpit to armpit)
Waist: 20.5" (measured across waist)
Shoulder: 18" (shoulder seam to shoulder seam)
Sleeve: 24.5" (shoulder seam to sleeve cuff)
Length: 28" (bottom of collar to bottom hem)