Example:
The children brought their outfits to the concert rehearsal so that they could try everything out before the big day. 
By Szater (Own work) [Public domain], via Wikimedia Commons
Photo license:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
The “it” Sound (/ɪ/): outfit
various items of clothing that combine together, often for sports players and for dancers