When there was no habit of or water available for washing closes everyday, this event had significance for the prevention of plagues by the semiannual replacement before summer when bacteria were likely to be developed.
衣服を毎日洗濯する習慣や水などのない時代、半年に一度、雑菌の繁殖し易い夏を前に新しい物に替える事で疫病を予防する意味があった。