Your New Secret Weapon

Three-piece suits are what the British might call "full-on": They're dressier and feel kinda like a passport to legitimacy. Here, JGL proves that a slimmer cut makes an old standby like this gun check look fresh—even downright heroic.

Suit, $3,990 by Ermenegildo Zegna. Shirt, $295 by Burberry London. Tie, $115 by J.Lindeberg. Shoes, $1,390 by Tom Ford. Pocket square by Paul Stuart.