Gothic? No, you're mistaking the original upper-class WASPy American/British fashion sense for what Gothic is parodying.
(This character looks upperclass even to Japanese. Look at the long black hair - a signifier of wealth & hime-ness for the past millennia or so, since before the Heian era. And then you have the simple yet elegant hairband, dress, pantyhose and matching high heels.)
(If you don't believe me, ask yourself: which character in _Tukihime_ is this one nearly a clone of? How wealthy is she? What sort of school does she attend? What is her social position, or her class? Case closed.)