Though it's been gathering steam within the style set for a while now, a short sleeve button-up shirt is still a bit tricky for most men. Which is why so many guys are talking about it over on reddit's notorious male fashion advice subreddit (aka r/mfa). Esquire's Andrew Luecke noticed all the chatter and decided to write a comprehensive guide to wearing one of summer's must-have items. "There are crucial keys to pulling off the short-sleeved button-up," writes Luecke. "Thankfully these are the same keys to pulling off anything else: fit, color, print, details and silhouette."