There's a few classic menswear items that Marlon Brando has popularised over the years: the leather biker jacket in The Wild One, the buffalo check bomber in On The Waterfront, the refined-yet-dangerous tuxedo look in The Godfather and the sparkly white turtleneck jumper in Superman (the last one's happening, you just wait). But it's a humbler Brando-endorsed item we're celebrating today – blue jeans.