The yellow jersey The yellow jersey, still worn by players today, went across football fields and bleachers. It was first used in the 1930 World Cup when it was awarded to Argentine player Juan Dominguez Moreno. He had been involved in an accident while training with his national team which left him paralyzed from the chest down. The white shorts/socks The white shorts/socks, also known as la roja (the red), are the traditional uniform colors of Brazilian football (soccer). They were originally black but were changed after the 1934 tournament when they were replaced with red shorts and socks. The new look became popular and is now standard for all professional clubs. During this time, there was no provision for substitutes so teams usually played one up front with only a goalie as back-up. This often led to heavy casualties among the forward players due to the intense physicality of the sport. Modern rules were introduced in 1938 and have remained largely unchanged since then. Currently, most clubs wear yellow shirts and white shorts/socks. A few remaining clubs like Flamengo or Vasco da Gama still use black as their main color.