Since there was an unspoken understanding that there were only eight agate sashes in Japan, dancers borrowed them from others to practice and no other people were permitted to use them during this time.
建前上、日本には瑪瑙の帯は八本しかないとするのが暗黙の了解であったため、舞手は人から借りるなどして用意するためほかの人間は使えない。