endimanché

dressed in one's Sunday best

ɑ̃ . d i . m ɑ̃ . ʃ e → endimancher
en in/into; cause to become + dimanch Sunday + é past participle
adjective Rare #45,033
dressed in one's Sunday best Often describes someone dressed in especially nice clothes, traditionally for Sunday.
FR: Il est endimanché pour la cérémonie.
EN: He is dressed in his Sunday best for the ceremony.

Tom était endimanché.

Tom was in his Sunday best.

Il est endimanché.

He is dressed up.

Où tu vas tout endimanché?

Where are you going, all dressed up?

— Quand passent les cigognes (1957)

Pourquoi es-tu tout endimanché?

Why are you all dressed up?