dress-up

[ dres-uhp ]
/ ˈdrɛsˌʌp /

adjective

being an occasion, situation, etc., for which one must be somewhat formally well-dressed: the first dress-up dance of the season.

noun

Informal. Usually dress-ups.
  1. a person's best clothes: Wear your dress-ups for the reception.
  2. accessories or other added features: a car with custom dress-ups.

Origin of dress-up

First recorded in 1665–75; noun, adj. use of verb phrase dress up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for dress-up