Garb for a gala (3)
I believe the answer is:
tux
(Another definition for tux that I've seen is " Briefly, American dinnerjacket".)
I've seen this clue in The Wall Street Journal.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.