Until the end of the war, taking an examination to be drafted was regarded as a proof of becoming an adult man in the society, and people were encouraged to wear fundoshi at the examination (the regulations for physical examination of the army); and thus this helped Ecchu fundoshi to spread across the country, reminding people a 'fundoshi iwai', a rite to wear fundoshi as an adult man.
戦前までは徴兵検査を受けることで「成人男子に達した証」と社会的に認知されるようになっており、徴兵検査（陸軍身体検査規則）で褌の着用を指導していたことも、疑似「褌祝」として成人男子に越中褌が普及した背景があった。