Question: what are jiu jitsu gis made of?
Answer: The (Brazilian jiu-jitsu) Gi is a uniform for training in Brazilian jiu-jitsu, adapted from the keikogi (稽古着) in modern Japanese martial arts, especially Kodokan judo. A Gi, meaning dress or clothes, is typically composed of a heavy cotton jacket, reinforced drawstring trousers, and a belt which communicates rank.