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noun "Sunday best" describes the clothes some wear to church on Sunday. They're referred to as "best" because they're supposed to be your nice / dressy clothes.
Father wears his Sunday best
Mother's tired she needs a rest
The kids are playing up downstairs
Sister's sighing in her sleep...
Brother's got a date to keep
He can't hang around...
by rich rick February 26, 2012
The best band on long island.

Maybe even the world in like 2 years

Im not kidding.

Steve Tedesco you like sunday best right?
by ST9 April 12, 2009