də(ˌ)rēˈgər, -_riˈ-,+V -ər.; -gə̄,+V -ər., -ə̄(r adjective
Etymology: French
: prescribed or required by fashion, etiquette, or custom especially among sophisticated or informed persons : proper
instructions as to when and where a silk hat is de rigueur — André Maurois
the de rigueur luggage of a salesman — Bernard Kalb
a type of architecture that became de rigueur for suburban homes
at which it is de rigueur to drink as much champagne as possible — Robert Shaplen