De-rigueur meaning

də rē-gœr'
Required by the current fashion or custom; socially obligatory.
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Required by etiquette; according to good form; proper.
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Required by fashion; fashionable.
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Necessary according to etiquette, protocol or fashion.

Wearing a suit to a job interview is de rigueur.

This season, the little black dress is de rigueur.

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Origin of de-rigueur

Borrowing from French de rigueur (“required”), from de (“of”) + rigueur (“rigour/rigor”).