I created a tag for this specific outfit, same way as there is the meiji schoolgirl uniform as it is very specific and pretty prevalent. Heres the jp wikipedia article on it I found, where i got the name too https://ja.m.wikipedia.org/wiki/%E7%B4%8B%E4%BB%98%E7%BE%BD%E7%B9%94%E8%A2%B4