The following pictures show the novice student the correct way to put on the Budo Gi (uniform) and how to tie the Obi (belt).
As the last picture above shows, the belt is tied in a fashion so that if an opponent grabs one end and tries to pull you the belt will not tighten and thus will not strangle you at the waist possibly cutting off your breathing or circulation. This is an innovation from Judo where the chance of having your belt pulled by an opponent during grappling may be high.