Dressed up in one's best Sunday clothes; dressed formally or in one's finest attire.
From French 'endimanchée' (feminine form), combining 'en-' (in/dressed in) with 'dimanche' (Sunday). Originally described people wearing their best clothes for Sunday church.
This word perfectly captures a lost social ritual—when Sunday was so special that people had entirely different, more formal wardrobes just for that one day, and this French word crystallizes that specific cultural moment.
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