The self-paced Competitive Strategy course on Coursera skims game theory, I think. Might be too basic for you, but my non-tech/math co-workers enjoyed it.I was doing the Great Courses game theory lectures on audio in my car until I got to the point where it didn't make sense without the visuals. I'll have to try it in video soon.
Maybe ask if he does the shoulder thing regularly?
If he's gonna take in the sleeves from the shoulder you might as well have the shoulders taken in at the same time. Best case you get a suit you can wear. Worst case, you're out a suit that didn't fit to begin with, plus the alterations cost.
This is a different friend, who has not figured out that she has to put spaces between words or the #hashtag won't work.
But she's a model, and her photos in exotic locations are actually nice, so we let it slide...