Sorry, you're not Nick Wooster. While some guys can pull off a casual, lightweight sportcoat (with no structure and details like patch pockets) with a pair of khaki or navy shorts and a polo, a full-on suit is just ridiculous. It's highly impractical on cooler days, and still inappropriate for the office. Menswear is partly about pragmatism, and this trend has zero practicality to it whatsoever.