Ah, OK, that's what I suspected. I usually wear 44 or 46, depending, and have found Aero's sizing to be a bit confusing at times. My first Aero Highwayman was a 44 and fit too short. Then I had a cafe racer 44 that fit too tight. So I decided to next get a Highwayman 46, which fit OK but maybe a bit loose. Then I found a Happy Days jacket size 44 that fits perfectly. I once inquired about an A2 and Amanda recommended a size 48 due to the slim cut of the military jackets. I recently saw a good deal on a motorcycle jacket like yours, size 44, and thought about getting it but have decided against it. I think I'd probably have to go a bit higher for the motorcycle jacket.