sunday best[noun]Synonyms: finery, best bib and tucker, bravery, frippery, full dress, glad rags, regalia, war paint
Related Idioms: Sunday-go-to-meeting clothes
[TahlilGaran] English Synonym Dictionary ▲
ˌSunday ˈbest noun [uncountable] old-fashioned your/her/my etc Sunday best your best clothes, which you wear only on special occasions. Traditionally, people always wore their best clothes for going to church on Sundays.
[TahlilGaran] Dictionary of Contemporary English ▲