After laying them in the order of [a], [b], and [c] from below, pass the back strap [c] below the strap [a] and put it on the strap [a] so that three straps [a], [b] and [c] hang over the overlapped part.
下から(a)→(b)→(c)の順で重ねられたら、(c)の後紐を(a)の下にくぐらせ、(a)(b)(c)三本が重なった部分に垂れかぶさるように(a)の紐の上に出す。