in the raw vs in the buff

in the raw and in the buff both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in the raw	No	Yes	No	No
in the buff	No	Yes	No	No

As adjectives, in the raw and in the buff are synonyms defined as:

Other synonyms of in the raw include bare-ass, bare-assed, in the altogether, naked as a jaybird, peeled, raw, stark naked.

in the raw (adjective)	in the buff (adjective)
(used informally) completely unclothed	(used informally) completely unclothed