Judogi is the official Japanese name for the traditional uniform used in judo practice and competition.

Clothing is similar to karategi because it has a common origin. In the early 20th century, jigoro Kano derived the original clothing from kimono and other Japanese clothing, so the clothing is the first modern martial arts training uniform. Over the years, sleeves and trousers have been lengthened, materials and fit have changed, traditional unbleached cotton has now become bleached white, and blue judogi has also been on the market. However, the uniform is still very close to the one used 100 years ago. Other martial arts, especially karate, later adopted the training clothing style used in judo.

Clothing usually consists of three parts, which are usually cut from different fabrics: a heavy coat (uwagi), a light canvas pants (shitabaki) and a cotton belt (Obi). Although similar to the shorter kimono style, uwagi is always made of heavier cotton or a cotton blend. In addition to the cheapest and lightest cigars, all are cut with woven cotton, similar to Terry, but much more tightly woven. After the completion of the competition, the more expensive competition and hand-made clothes usually weigh several kilograms. Due to the nature of judo exercises, they usually have thicker stitches and double knee patches to provide durability. Different colors of belts represent different grades of judo.

In competition, judo size and fit are strictly defined by IJF judo rules (see below). These rules define the length of the sleeves and pants and how loose they fit. In a competition, it may be advantageous for a referee to disqualify an athlete by wearing unsuitable judo clothing. In addition, various organizations and activities monitor matters such as business and team / country patch additions and competitor names. All competitive clothing must be clean and free of holes, tears or excessive wear.

Only white or blue clothing is allowed in official national or international competitions. Contestants must use both colors at the same time, because one contestant in each competition is designated to wear blue GI while the other contestant wears white GI. Most judo courses allow students to wear any color, although white is usually the preferred traditional color, while white is more suitable for judo and Japanese cultural traditions. Less common colors, including red and black, can be found in less formal or specialized situations.

The left side of GI must go over the right side.