Douglas Harper's Etymology Dictionary
1756, French, literally "as it should be;" from comme "as, like, how," from Old French com, from Vulgar Latin quomo, from Latin quomodo "how? in what way?," pronomial adverb of manner, related to quam "how much?," qui "who" (see who).
Wiktionary
a. proper; in keeping with etiquette or social standards.
WordNet
Wikipedia
Compagnie des Tabacs Comme Il Faut, S.A. is an international tobacco company based in, Port-au-Prince, Haiti. It is owned by Luckett, Inc. of Louisville, KY and is the only cigarette maker in Haiti with its Comme Il Faut and Point brands marketed locally.
Usage examples of "comme il faut".
This was his way of showing how comme il faut he was, and how superior to the majority of men.
One of them was quite a handsome boy, and looked so comme il faut.
You know I am an Irishwoman and have a great contempt for your comme il faut English society, still there is no occasion recklessly to throw away one's reputation, when a little care would save it.