Walking the red carpet at the opening night of his brother James's new play, Of Mice And Men, Dave Franco looked fantastic in this double-breasted number. 

It's a difficult look to get right, but Franco nails it by going for a dark, form-fitting jacket, along with a matching knitted bow-tie and a smashing shirt in light polka-dot. Double-breasted suits are getting some serious trend traction from the A-list right now: the trick is to show some restraint with the rest of your outfit. Pro tip? Definitely go for a bow-tie rather than a straight tie to keep things clean.