be in (one's) Sunday best
be in (one's) Sunday best
To be wearing one's very best clothes, as one would wear to a Sunday church service. We're all in our Sunday best already, so why don't we go for lunch at a fancy restaurant? This is going to be a formal event, so we all need to be in our Sunday best. You can't wear jeans to a place like that! You need to be in your Sunday best.
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