comme il faut vs becoming

comme il faut and becoming both are adjectives.

Word	Noun	Adjective	Verb	Adverb
comme il faut	No	Yes	No	No
becoming	No	Yes	No	No

As adjectives, comme il faut and becoming are synonyms defined as:

Other synonyms of comme il faut include comely, decorous, seemly.

comme il faut (adjective)	becoming (adjective)
according with custom or propriety	displaying or setting off to best advantage
	according with custom or propriety