Crossword Genius

Swedish actress slipping off Oscar outfit (4)

Ross

I believe the answer is:

garb

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for garb that I've seen before include "Dress - clothing" , "Fashion of dress" , "Kit" , "Covering" , "Attire, clothing" .)

I've seen this clue in The Telegraph.
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