Profile of Black Yi Girls in Xichang

Hairstyle
Having hairs uncut since a little girl, females of the Yi ethnicity would first comb one single braid hanging on the back of head, adopt a bun hairstyle when grown a little older and start to wear two braids from the day of getting married. And in some cases, females who reach adulthood but not yet get married are also allowed to wear twin braids after an official ceremony held on an auspicious date.
Quote from page 29 in A Research Report on the Yi People in Xikang by Zhuang Xueben