In welchem Jahr wurden Schuluniformen in Japan eingeführt

die
mädhcen in den ober- und mittelschulen trugen die uniform ( matrosenanzug). Der wurde in Japan zum ersten Mal 1921 eingeführt

Noch ein Tipp: Wenn dir die deutschsprachige Wikipedia nicht ausreicht (weil z.B. über die Schuluniformen der Jungen kein genaues Datum zu finden ist), dann klick doch mal weiter zur englischsprachigen Wikipedia:

Zitat:
Educational establishments existed in fedual Japan. The modern educational system began to yake shape after the last Shogan, Hitotsubashi Yoshinobu, resigned in 1867 and the Emperor, Mutsuhito, assumed the powers of the actual head of state. Mutsuhito took the name Meiji ("Enlightened Government") to designate himself and his reign. Feudal fiefs were surrendered to the Emperor who ininitated a series of political and social reforms aimed at transforming Japan into a modern state. One of these steps was the creation of a public education system by the enactment of an education law in 1872 which mase 4 years of compulsory education manditory. This was extended to 6 years in 1907. Primary education was coeducationanal and free. No uniforms were required for primary children, but many schools adopted them. Those primary schools requiring school uniforms in the 20th century have usually required short pants for boys.

Hier eine nette Seite mit Beispielen der Schuluniformen aus der Meiji-Zeit (= Beginn der allgemeinen Schulpflicht in Japan):

http://pingmag.jp/2008/03/31/japanese-school-uniform/