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.
See also: Sunday
Farlex Dictionary of Idioms.
See also:
  • in (one's) Sunday best
  • in Sunday best
  • Sunday best
  • your Sunday best
  • (one's) Sunday best
  • get into (one's) Sunday best
  • (had) best (do something)
  • best do
  • as best (one) can
  • as best you can