Although there are some hypothesis about the origin, only female kimono and children's kimono have Miyatsukuchi and Furiyatsukuchi, in order to adjust the layer around the waist Ohashori for the female kimono, and in order to pass a cloth cord through for the children's kimono.
身八つ口と振八つ口は女性用の着物と子供用の着物にのみあり、由来については諸説あるが、女性用の着物の身八つ口は主におはしょりを整えるために、子供用の着物の身八つ口は主に紐を通すために利用されている。