A real goth doesn't conform to any trend. Wearing all black was an attempt to defy conformity, before it became a trend in itself. Real goths don't give much of a fuck about what they wear, it just happens that they wear black. This labeling is all about a persons mentality and beliefs, not the way the dress. Of course, because of little idiot kids, Goths have now become shamed... all because of little fuckheads trying to be different. It's all about the music and your mentality, not the way you appear.
Just because someone wears black, doesn't mean they are goth.