Incidentally, although in costume dramas, kimono of the common people are stock examples with black collars, this fashion came from the last days of the Tokugawa Shogunate, thus it is strange that this fashion appears in the TV drama 'Mitokomon' where time is depicted as the Genroku era.
ちなみに時代劇では庶民の着物は黒襟と決まっているが、この流行は幕末の物であり、元禄時代が舞台の「水戸黄門」に出てくるのはおかしい。