Yes... I'm a huge Hitomi fan so I know all of that, my point is she's not overly Asian she looks acts and dresses in western styles. That's what I mean, she's not overly Japanese at all, she's definitely more of a western character. Not to mention she actively lives in Germany with her father.
That's all I mean by my comment, her name is the only thing that makes it obvious she's part Japanese, she would get a native German costume not Japanese.