The label says Medium, but the coat can easily fit up to large 40-42 inch chest, but please check the measurements (especially Pit to Pit) to get a good idea of the size of the coat.

Item No
275
26	Inches	Pit to Pit	Measurements were taken by laying the item down flat and measuring from the seams.
26	Inches	Waist
18	Inches	Pit to Cuff	By comparing the measurements to something that already fits well will give you an idea of the item fit.
25	Inches	Cuff to Shoulder
23	Inches	Shoulder to Shoulder	Photos were taken on a 38 inch chest (medium) mannequin. Happy to answer any questions
41	Inches	Collar to Hem