costumenumber
nounUK /ˈkɒstjuːm ˌnʌmbə/
US /ˈkɑːstuːm ˌnʌmbər/
A costume number is a tag that tells you which costume is yours.
The teacher gave each child a costume number before the school play.
OTHER MEANINGS
2. A numbered outfit in a catalog or rental shop.
She picked costume number 12 from the rental list.
3. A short performance piece done in costume.
The dancers rehearsed their costume number for the show.
4. A code used to track costumes in a theater.
The stage manager wrote the costume number on every hanger.