GANT Rugger spring/summer 2013 lands in Florence, Italy in June when the menswear cognoscenti are summoned to Pitti Uomo. Just don’t call it a trade show. Ostensibly a marketplace, Pitti is just as much a global congress of style attended by effortlessly debonair Italian guys, their imitators, earnest brand men, clothes geeks, street-style lensmen, revered…