What does it mean to be a costume?

Follow the ceremony and become a suit. In the old yellow calendar, becoming a uniform means following the ceremony and becoming a uniform. In the old days, after the funeral, relatives put on different mourning clothes according to their closeness to the deceased, corresponding to "undressing" and "undressing" after the third anniversary. "Book of Rites" said: "Only parents' funeral, see the stars, see the stars and don't give up, if not, take off your clothes and go. "