your Sunday best
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(one's) Sunday best
One's very best clothes, as one would wear to a Sunday church service. Instead of some big party, let's all get dressed up in our Sunday best and go for lunch at a fancy restaurant for my birthday! This is going to be a formal event, so please come dressed in your Sunday best. You can't wear jeans to a place like that! You need to be decked out in your Sunday best.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
your Sunday ˈbest(informal, humorous) your best clothes: She got all dressed up in her Sunday best to meet her boyfriend’s parents.
Farlex Partner Idioms Dictionary © Farlex 2017