Because it's almost fall and you're dying to wear something autumnal. Because plaid just has a laid back, easy feel. Because sporting a plaid shirt at the office with a tie is a lot cooler than just your average blue button-down. For all these reasons and more, we're seeing a lot more plaid shirts lately. Not lumberjack (or hipster) flannels, but trim dress shirts with a small, muted tartan to them. Wear them with dark denim and roll up the sleeves now, and when the mercury drops, they'll pair perfectly with your puffer vests, dark wool suits and tweed blazers.