At this point, the double-breasted jacket is headed in the direction of skinny jeans and bombers: past the point of trendy, but squarely in the vault of things guys can safely wear and still look stylish.
So long as it fits, that is.
At Thursday night's premiere of his new film, Eddie the Eagle, in London, Taron Egerton showed up in a sharp, steely gray double-breasted jacket from Burberry. It would have been a great look for the actor, if it hadn't been just a shade too small. Anyone who's seen Egerton's highly physical breakout performance in Kingsman: The Secret Service will know that Egerton works out; it's understandable that he'd have to pack on even more muscle before the filming of the sequel starts.
WireImage
But putting your jacket under enough strain that you can see its material warp is a no-go, no matter how powerful your build is. Instead of showing off all the hours you put in at the gym, the way a great-fitting T-shirt does, a jacket that's too tight just looks like it's too tight. And when it's a double-breasted jacket, whose two rows of buttons have the tendency to draw the eye across your body, the effect can even make you look pudgy. And that's not what a suit that fits right is supposed to do.
So instead of getting a jacket that fits more like a sausage casing than something a decent tailor would sell you, opt for a version that's slim enough to show your shape without turning its buttons into dangerous projectiles. You can find all the rules for how a double-breasted suit should fit you here.