Karate uniforms, traditionally called "Gi", are designed to facilitate the various types of movements common to the practice of martial arts. They are a traditional outfit that karate students and teachers have worn for generations. They are available in different weights and styles, but almost always consist of three main components; jacket (Kimono), pants (Zubon) and of course the belt (Obi).
The use of Gi is highly recommended when practicing karate. Unlike most other garments, a Gi is designed to withstand significant abuse. They are often made of a heavy cotton canvas material, although the weight of the material may vary. This material is exceptionally strong, allowing it to survive through years of being pulled, scraped, beaten, sweated and naturally washed. It is also an exceptionally flexible material, which is important to give the student comfortably the necessary movements.
Karate uniforms are also available in two basic styles, normal court and tournament court. A typical Gi has sleeves and pants that reach the wrist and ankle respectively. In comparison, cut uniforms in the tournament are a bit narrower and are cut under the ankle and wrist. This allows the student to move freely without worrying about accidentally clutching a finger or tripping over the longer hanging pants of a normal Gi.
Gi karate is based on the traditional judo uniform. It is believed he was adopted by karate practitioners after Master Funakoshi used one while conducting a demonstration, at the request of Judo Kano's teacher. Before that, most karate was done simply in shorts. However, Master Funakoshi was so impressed with the uniform that he had Okinawa with him, and these tokaido karate uniform have been worn ever since. Today, they are the most easily recognizable martial arts uniforms on the planet.
Finally, a student must do his best to ensure that his Gi remains in the most pristine condition. Tradition dictates that a uniform should be clean every time a student sets foot on a dojo as a sign of respect.