your Sunday best1 DCCyour best clothes, worn only for special occasions or for church 〔某人〕最好的衣服，盛装 → your Sunday best at Sunday(1)
2 → your/her/my etc Sunday best at Sunday best(1) your best clothes, which you wear only on special occasions. Traditionally, people always wore their best clothes for going to church on Sundays.
3 DCCBEST old-fashioned your best clothes, that you only wear on special occasions 节日的盛装 → your Sunday best at best3(14)