It's tagged a 40 but fits like a 42. Here are the measurements I sent Shawn:
Sleeve length: 26"
Shoulder to shoulder: 19"
Actual measurements, as seen in the photos, are pretty close. I'm selling bc this doesn't really fit my wardrobe and the wrist circumference is a little tighter than I like. My shirt sleeves get caught and it annoys me such that I avoid wearing this one. No other complaints about the jacket. In my opinion, you'll be hard pressed to find an equivalent jacket for the price.