Respect for age is de rigueur at all times, like clean hands.
It is de rigueur that he should carry some piece of iron on his person.
In those days handwriting and spelling were not "de rigueur."
It was de rigueur for ladies to conceal their faces with fans.
It may be added that a spirit lamp beneath the dish is (or should be) de rigueur.
The green paint is de rigueur; duck's egg colour; I've got to like it.
Bad for poor people who can afford only the 21 days de rigueur.
But no; the chairs were de rigueur, with crests on the back of them.
Everything must be de rigueur, or I should never forgive myself.
Aperients at the commencement of training used to be de rigueur.