coatroom

2. A small room in a school or office where coats are hung during the day.

The children hung their raincoats in the coatroom before class.

3. A storage area in a theater or hall for keeping outerwear during an event.

The theater's coatroom was full of winter coats.

4. A room in a building where visitors can leave their belongings temporarily.

Please leave your umbrella in the coatroom near the entrance.