Red carpet attire (4)

I believe the answer is:

gown

(Other definitions for gown that I've seen before include "Formal robe" , "Woman's long dress or judge's robe" , "A woman's long dress, or an informal dressing garment" , "Academic or formal wear" , "Garment (academic, formal, or protective)" .)

I've seen this clue in The New York Times.

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