evening dress
US /ˈiːv.nɪŋ ˌdres/
UK /ˈiːv.nɪŋ ˌdres/

1.
a woman's formal dress, especially one worn for an evening event or ball
:
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She wore a stunning red evening dress to the gala.
•
The boutique specializes in bridal gowns and evening dresses.