Cap And Gown

( the outfit one wears at a formal ceremony such as a college graduation ... )

The clothing a student wears at her graduation ceremony is a called a "cap and gown" because it has a special hat ("cap") and a fully-body piece ("gown") which is worn outside of one's clothing. Example: "I love this photo of you and your friends in cap and gown." Another example: "Remember: By 10 am we all need to be in cap and gown."

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