Animegirl supremacist (nprofile…zvpn) I gather this is not really "traditional," see the skirt for example. It's not a kimono or anything else I know of albeit based on a limited knowledge of older era women's clothing, but this combo of traditional top, long skirt and boots is something I see all the time in anime and manga set in the Taishou period, which for the emperor of that name is 1912-1926.
And, yeah, it's very attractive.