a person's best or newest clothing, as saved for Sundays and special occasions.
Also called Sunday best.
Origin
1635-45
British Dictionary definitions for sunday best
Sunday best
noun
1.
one's best clothes, esp regarded as those most suitable for churchgoing
Slang definitions & phrases for sunday best
Sunday best
noun phrase
One's best clothes; best bib and tucker: both wearing what Delaney descibed as Sunday-go-to-meeting clothes
[entry form 1779+; fr the earlier Sunday-go-to-meeting clothes]
Idioms and Phrases with sunday best
Sunday best
One's finest clothes, as in They were all in their Sunday best for the photographer. This expression alludes to reserving one's best clothes for going to church; indeed, an older idiom is Sunday-go-to-meeting clothes (meeting here meaning “prayer meeting”). [ Mid-1800s ]