Found 2 items, similar to De rigueur.
English → English (WordNet) Definition: de rigueur de rigueur adj : required by etiquette or usage or fashion; “instruction as to when and where a silk hat is de rigueur”
English → English (gcide) Definition: De rigueur De rigueur \De ri`gueur"\ [F. See 2d Rigor.] According to strictness (of etiquette, rule, or the like); obligatory; strictly required. [Webster 1913 Suppl.]