The husbeast came home and tried on the sweater.
After I got done spazzing out, I got a measuring tape, did some checking, and realized the husbeast is FOUR INCHES (about 9cm) wider through the shoulders than his dad is. (So much for that 'about the same size' theory.) With that in mind, it fits okay, except I do have to do more work on the neck with the back-and-forth stuff at the back to raise it up. Way too low back there right now.