In ancient Japan, ninja warriors wore black so they wouldn't be seen at night.
Some of the schools in Japan make students wear yellow hats for safety reasons.
To make sure no boy or girl stands out, boys and girls dress the same. Students from the same school dress the same. Boys carry a black backpack and girls carry a red backpack. When many people get home from work in Japan, they wear jeans.
On special days, men and women wear kimonos. People do not wear socks and shoes with kimonos. Instead, they wear wooden sandals.