comme il faut[adjective]Synonyms: decorous, becoming, befitting, conforming, correct, decent, nice, proper, right, seemly
 [TahlilGaran] English Synonym Dictionary ▲
 comme il faut adverbial & pred. adjectival phr. [kɔm il fo, kɒm i:l fǝʊ] M18.[French, lit. 'as it is necessary'.]Proper(ly), correct(ly), as it should be (esp. of behaviour). 
 [TahlilGaran] English Dictionary ▲
 be comme il fautbehaviour that is comme il faut is correct because it follows the formal rules of social behaviour
 [TahlilGaran] English Idioms Dictionary ▲