On July 16, 1970, the Pittsburgh Pirates opened up Three Rivers Stadium, but more importantly, most importantly, they debuted baseball's first real uniform. No more sweaty flannel, no more nonsensical buttons, no more clunky, constricting belts. Pullover jerseys and beltless "sansabelt" baseball pants. The genesis of the Ultimate Baseball Look and the very beginning of the Golden Age of the Baseball Uniform. Anyone who claims to be interested in baseball uniforms, logos or sports aesthetics in general, should set aside an hour every July 16 for quiet contemplation just to reflect on the historical significance of that moment that occurred in Pittsburgh, Pennsylvania.