"Later, when the tate-eboshi and a sword were no longer used and the performer wore only a suikan, the performance became known as shirabyoshi (white rhythm)." (Excerpts from the chapter in "The Tale of Heike" called 'Gio'.)
「途中で烏帽子、刀を除けて、水干だけを用いるようになって白拍子と名付けられた。」（「祇王」の章）