Here's a blazer I picked up last week. 38S when I usually wear 40S in most jackets.
Thought the arms would need shortening as they are bizarrely long for the tagged size, but what needs pst attention are the shoulders.
Got the measuring tape out once I got it home, and they are 20" across, which is huge for a 38S jacket.
So here's a photo. Arm length doesn't look as bad as I first though, but what can be done with the shoulders?
For comparison, here's a 40S Daks...