noun
A cap worn as part of a school uniform, typically associated with traditional Japanese school attire.
昔の学生は学生帽をかぶって通学していた。
Students in the past wore school caps to school.
制帽 is a broader term for any regulation cap or uniform hat, while 学生帽 specifically refers to a student's cap.
Compound of 学生 (student) and 帽 (cap).