black tie

black tie (countable and uncountable, plural black ties)

1. (countable) A black bow tie worn with a dinner jacket.
2. (uncountable) Evening dress; a standard of dress which is less formal than white tie, consisting of black dinner jacket or tuxedo jacket, and matching trousers, white shirt and black bow tie or, possibly, military dress or national costume.
3. Used other than figuratively or idiomatically: see black,‎ tie.

• (evening dress): dinner jacket, tux, tuxedo

• (standard of dress): business casual, casual, dress casual, formal, informal, morning dress, national costume, white tie

• black tie on Wikipedia.Wikipedia
• bowtie

• tickable