We are familiar with uniforms in schools and other educational institutions wherein students are made to wear the same kind of dress to bring in uniformity among them.  Even in the adult world, each profession has a code of conduct and is required to dress in a particular way.  http://workwarehouse.blogspot.com/2014/05/hi-vis-work-wear-sydney-is-of-high-quality-and-comfortable-for-daily-use.html