Tobi trousers or tobi pants () are a type of baggy pants used as a common uniform of , construction workers in Japan who work on high places (such as scaffolding and skyscrapers). The pants are baggy to a point below the knees, abruptly narrowing at the calves so as to be put into the footwear: high boots or (-style boots).
According to a spokesperson for , a major manufacturer of worker's clothes of this style, the style was developed from knickerbockers which were part of Japanese military uniform during World War II. The regular knickerbocker-style pants are called "" ("" meaning "trousers" and "" or "", a transformation of the word "knickerbockers"). The excessively widened ones are called . This style has also entered popular fashion, as evidenced by the emergence of (" maniacs"), die-hard fans of trousers.