According with custom or propriety. Synonyms:becoming, comely, decent, decorous, seemly."Comely behavior" , "It is not comme il faut for a gentleman to be constantly asking for money" , "A decent burial" , "Seemly behavior"
... blasphemy has its deserts, then. But I cannot help being glad for you that his kinswoman will be your servant, for you are ill fitted to grow maize with the painted savages, ma plus douce! But how strange that even a distant relative of one so comme il faut should be of a sort to ... — Margarita's Soul - The Romantic Recollections of a Man of Fifty • Ingraham Lovell