Определение sunday best в Английский Язык Английский Язык словарь
A person's finest clothing, especially the clothes one reserves to wear to church on Sunday
More than 250 people, most of them African-American churchgoers dressed in their Sunday best, erupted in screams when the presidential motorcade turned onto the street.
If you are in your Sunday best, you are wearing your best clothes, which you only wear for special occasions. One's best and often most formal clothing