Answer: blacktie

AnswerCrossword Clue
BLACKTIESemiformal, as an affair
BLACKTIESemiformal
BLACKTIEFormal
BLACKTIEFairly formal
BLACKTIEFormal indication
BLACKTIERequiring a dinner jacket
BLACKTIEFormal-affair wear
BLACKTIEEvening wear.
BLACKTIEOrder of dress.
BLACKTIEFormal wear
BLACKTIEFormal, but not too
BLACKTIEPhrase on some invitations
BLACKTIEFund-raiser wear, perhaps
BLACKTIELike some formal events
BLACKTIEFormal attire