Goth the Marissa Cooper way... full skirt, ballet flats, and a cashmere tank. Is my tank cashmere? NO, of course not, it's like, cotton/poly or something. But Marissa Cooper's would be. In case you didn't get it, it's goth because of the skulls and the itty bitty ankh dangling ear chains.
I understand that Marissa Cooper would never be goth, but she would probably think she was if she wore skulls. Or at least her mum would and then she'd kick her Satan-worshipping daughter out of her mansion lest she get booted from The Newport Group or something equally inconvenient. A girl has to do more that fraternize with the minority gardener to get some damn attention.
Of course, Marissa ONLY wore Chanel. So, keep the ballet flats, screw the ankh earrings, and leave the skulls to.. who.. who would wear skulls...
OH!! Anna would wear skulls.