The shoe is the Stan Smith. A white-leather number with pale green accents introduced in 1971, the year before Stan Smith (the player, now 70) earned his second and last Tennis Grand Slam singles title. Thanks to a well-orchestrated promotional blitz, this unlikely hero has made one of the greatest comebacks in marketing history. Recently hailed as one of the most important sneakers in the world, the legendary Adidas Stan Smith sneaker has SERIOUS street cred. We’ve been seeing these shoes everywhere over the last few months. Celebs, streetstyle blogs, fashion shows, you name it. Stan Smiths are the sneaker to be wearing…