Even in the case of the Army Cadet School or the Naval Academy which teenage boys entered (the former at thirteen years old, and the latter at seventeen years old), once a boy entered them, the staff directed him to send back all his personal belongings including undergarments to his home in order to exclude "yearning for the outside world", and provided the new student with white Ecchu fundoshi as undergarments.
十代の少年が入校する陸軍幼年学校（13歳）や海軍兵学校（17歳）でさえ、入校したら、「娑婆っ気」を排斥する目的で、下着を含めて一切の私物は自宅に送り返すように指導し、入校者に下着として白い越中褌を支給した。