Ignore the "noise" and go back to first principles.

Since "same" modifies the noun "outfit" it is ipso facto an adjective.

Since "exact" modifies the adjective "same" it is ipso facto an adverb.

Otherwise these grammatical terms are effectively imprecise and thus meaningless.

As for "the sweater is dark blue," "blue" is an adjective thus "dark" must be an adverb.

One problem with English grammatical terminology is that too much of it represents usage more applicable to Classical Latin.

Many English "grammar concepts" have been hammered out artificially from Latin models.