The clothing worn during seppuku consisted of a plain white kosode (a kimono with short sleeves) and a light yellow linen kamishimo (ceremonial costume) with outer pleats and no family crest, and the back of the collar of the kosode was sewn in such a way that made it easy for the kaishakunin to behead the seppukunin.
切腹の際の装束は、着衣は白無地の小袖・浅黄色の無紋麻布製の裃で襞は外襞、小袖は首を打ち落とし易い様に後襟を縫い込んでいる物と決まっていた。