In the 1990s terrible grunge fashions and glamour ruled. The designer Hedi Slimane changed that by reviving the suit, I was once told.
It is not that simple probably but it makes sense, when you hear that Hedi Slimane favoured a narrow and tight cut. That is the cut on street today as well.
Young men are better fit for it usually. You need a slender build to have a chance to pull it off. These guys in Pitti Uomo are doing well.
Source: The Journal of Style in Florence