Not every girl who dresses up in goth/psuedo-goth style is a "bad girl"... (they just draw her that way - no wait, wrong reference) they just want people to think they're bad (or at least, not such a "good girl").
Actually, having known some goth girls and preacher's daughters, the goth girls were the ones who pretty much were just difficult to approach, but fairly normal people when you got to know them... it was the preacher's daughters that went and attempted suicide or got pregnant in high school or drank themselves nearly to death.
...
... Actually, I think the clothes look alright on Sanae.