This type of photo is a core reason I started The Sartorialist blog.
As a young man I learned the general rules of fashion, like horizontal stripes making a person look wider. It sounded reasonable so I blindly accepted it to the point I’ve never owned anything close to a striped t-shirt.
Then last January at Pitti Uomo I saw this gentleman wearing a plaid jacket with a very pronounced horizontal stripe. As opposed to making look wider it did the exact opposite. The strategically placed stripes dropped at least ten pounds on him by emphasizing the narrowness of his waist when counterbalanced with the broadness of his shoulders.
This is real sartorial genius.