the academic cap or mortarboard and the robe worn in formal academic ceremonies. We all had to rent cap and gown for graduation.I appeared wearing my cap and gown, but I had shorts on underneath because it gets so hot at that time of year.
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]