Nightwear’s tight – good to go naked (2,3,3)

Ross

I believe the answer is:

in the raw

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'naked' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for in the raw that I've seen before include "plain" , "Naked, or without refining influence" , "Undressed" , "21 26 [IN THE ALTOGETHER]" , "Completely unclothed" .)

I've seen this clue in The Guardian.

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