Any Goth worth her salt will tell you that funereal black is the color to wear, although, in a pinch, other dark colors will do. The preferred style of dress is loose and flowing. Capes are tres chic. Goth girls typically wear long skirts, with little skin showing. In keeping with the persistent death motif, Goth jewelry is often a horrific mishmash of tiny plastic skeletons, skulls and other ghoulish trinkets.
Symbols associated with witches and magic are popular too.
They're dark and mystical, and I'm really into stuff like that. Lauren, for example, had her belly pierced. She had so many problems with navel jewelry irritating her skin, though, that she let the hole close back up. Goth makeup, not surprisingly, is dark. Sort of, ah, corpse-like, if you will.