Judogi
Judogi (柔道着 or 柔道衣) is the formal Japanese name for the traditional uniform used for Judo practice and competition. As with most Japanese martial arts uniforms it is actually derived from traditional articles of clothing suitable for work. Most likely Jigoro Kano derived the original judogi from the kimono and other Japanese undergarments around the turn of the 20th century. A judogi is comprised of two parts usually cut from different styles of fabric, a very heavy uwagi or jacket and a lighter canvas style zubon or pants. Though similar to the shorter styles of kimono, a uwagi will invariably be made from cotton or a cotton blend and be of a very heavy weight fabric. All but the cheapest and most lightweight uwagi are cut from a heavy canvas style cloth, similar to, but much more tightly woven than terrycloth, and more expensive competition and hand-made judogi will often weigh several kilograms when finished. The zubon or pants are generally cut in a similar manner to Karate but nothing like Aikido zubon. Due to the nature of Judo practice they commonly have heavier stitching and double layer kneepatches to provide durability.
Unlike some more traditional martial arts judogi are strictly defined by the IJF rules of Judo (see below) in order to prevent a competitor from using an improperly sized judogi for advantage in competition. These rules define how long the sleeves and legs must be as well as how loose fitting the judogi can be. In addition various organizations and events define such matters as allowing for commercial and team/national patches and competitor's names to be attached to the judogi.
In official international competition only traditional white or unbleached cotton as well as blue are allowed, though many less common variations including red and black can be found in less formal or specialized situations.
The left side of the gi must cross over the right one. After a person is dead the reverse is true, so japanese people frown when it is done incorrectly.
Today, companies like Adidas and Mizuno also produce Judogis. Although these products are more expensive, quality is assured.
Judogi weights
Judogis typically come in one of two weights: single-weave, or double-weave. Single-weave dogis are thinner and weigh less. This makes them less durable, although some judoka (judo practitioners) may prefer them for long practices as they are less likely to faster overheating. Double-weave judogis are thicker and weigh more--sometimes considerably more. They are often harder to grab than single-weave gis, which is an advantage in competition. Double-weave gis are often said to shrink less--this is a real issue in a sport that carefully regulates the fit of the gi. Double-weave gis generally cost considerably more than single-weave gis of comparable quality. It is difficult to tell single-weave from double-weave pants visually (although they can be distinguished by weight), but double-weave jackets can easily be distinguished visually from single-weave jackets by a line that runs down the back of a double-weave jacket but is absent on a single-weave jacket.