They made clothing from the fibers of hemp and kozo since ancient times, and especially the bark fibers of kozo was called 'yufu,' which was refined in thread-like form by steaming the fibers of peeled bark and exposing them to water.
古代から麻や楮の繊維から衣料を作ったが、特に楮の皮の繊維は「木綿（ゆふ）」と呼ばれ、剥いだ樹皮の繊維を蒸した後、水にさらして糸状に精製したものである。