Compare evening dress.
Origin of formalwear
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for formalwear
His penchant for formalwear helped, but it had more to do with him pulling a party together and then retreating from it.Accidental Billionaires
Samuel P. Jacobs
July 16, 2009