Wondering what everyone’s going to be wearing this summer? The street style outside London’s menswear shows should be your first clue. We’ve seen guys in jean shorts and oversize blazers; inside-out sweaters; flowery bags; and lots of statement jackets, from millennial pink to painted denim. You’re bound to see a lot more color—not just at the London shows, but in Florence, Milan, and Paris, too—and plenty of streetwear. Keep up with the action and emerging trends with Gianluca Sinese’s…