Awesome look. I love the colors in the blazer, too. I'm not much of a plaid person, but that's a plaid I could definitely wear. I could make something like that, but it would be a Serious Project!
The beauty of this blazer is the cut of it. Not too long, not too short (not "shrunken"), the shorter sleeves, two buttons rather than three, which give it the schoolboy look of the title, without being super stylized or looking like it's trying too hard. (I would see three buttons as stylized--a distinct look).