dinner jacket
US /ˈdɪn.ər ˌdʒæk.ɪt/
UK /ˈdɪn.ər ˌdʒæk.ɪt/
1.
a man's formal jacket, traditionally black or white, worn for evening events; a tuxedo jacket
:
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He looked very smart in his new dinner jacket.
•
A black tie event requires a dinner jacket.