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job-hunting suit (plain dark suit worn by students)
The plain black or dark navy suit, worn with a white shirt, that university students put on for company information sessions and interviews during job hunting (就職活動). A Japanese coinage; the uniform look is part of the custom.
Seeing crowds of students in identical dark suits each spring is a familiar sight in Japan, and the conformity is often discussed. Some students wear the suit again at their company's entrance ceremony (入社式) and then switch to ordinary business suits.