Karategi (空手着 or 空手衣) is the formal Japanese name for the traditional uniform used for Karate practice and competition.
A karategi is somewhat similar to a judogi (柔道着 or 柔道衣, "Judo uniform") as it shares a common origin; however, the material and cut of the uniform is generally much lighter and looser fitting. The heaviest of Karategi are only 0.5 kg (16 oz) compared to some judogi at 1 kg (35 oz). Because of the nature of Karate training which emphasizes striking, kicking and a more limited range of standing throws compared to Judo the karategi has evolved in a manner that maximizes mobility and speed without the extremely coarse and strong fabric required for grappling and throwing found in Judo. They are made from smooth cotton which may be brushed or ribbed for unrestricted movement and added comfort. Reinforced stitching is common, as to compensate for the stresses put on the gi.
This tag implicates dougi (learn more).