cap and gown

noun

1. a ceremonial mortarboard and gown worn by faculty, students, etc., as at commencement.

Word History and Origins

Origin of cap and gown¹

First recorded in 1855–60

Idioms and Phrases

Ceremonial dress worn at graduation exercises; by extension, the academic community (also see town and gown. For example, Mary was very proud) when she received her cap and gown for commencement. [Mid-1800s]

Example Sentences

Will you walk the stage in the spring in cap and gown?

From Los Angeles Times

As she walked across the graduation stage in her cap and gown, she waved it above her head despite being terrified that doing so would land her in trouble.

From Los Angeles Times

Alisa Perales, 11, will become the youngest graduate of Crafton Hills College in Yucaipa when she dons her cap and gown this week.

From Los Angeles Times

She has a cap and gown to get ready.

From Los Angeles Times

In a more recent post, she shared video of the cap and gown she intended to wear to graduation, with the caption "3 more weeks".

From BBC