The Karate Belt "Obi"

Ok.... lets keep this simple,

In the beginning way back before the Japanese martial arts had been arranged into individual structured systems the only reason for a belt to be worn was to hold up your pants !

This was because the practice of Japanese martial arts was more a way of life (Budo) for the Samurai rather than a sport or pastime, each discipline evolved as part of the Samurai's military training and skills development in relation to close quarter combat.