Crossword Genius

Strictly according to fashion (2,7)

Ross

I believe the answer is:

de rigueur

(Other definitions for de rigueur that I've seen before include "Proper" , "Required by strict etiquette or fashion (French)" , "Required by etiquette, as in France" , "Strictly" , "Obligatory" .)

I've seen this clue in The Telegraph.
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