The word for today is…
de rigueur (adjective):
: prescribed or required by fashion, etiquette, or custom : proper
Source : Merriam -Webster
Etymology : de rigueur, is a direct borrowing from French where it means “out of strictness” or “according to strict etiquette.” Rigour is also what distinguishes de rigueur from a similar French borrowing, du jour. While the latter describes things that are popular, fashionable, or prominent at a particular time, as in “topic/style/buzzword du jour,” de rigueur describes that which is considered mandatory by fashion, etiquette, or custom for acceptability within a given social sphere or context. A bucket hat, for example, may be the chapeau du jour if it is currently popular or prevalent, but it would only be de rigueur if, among a certain crowd, you would be given the side-eye for not wearing one.
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