Otherwise known as a mallgoth, an off the rack rebel will think they're so individual for shopping at Hot Topic and Strhess, while failing to realize that goth and punk were meant to break free of subcultures, and not conform to its own subculture. Also, a poseur.
mallgoth: Hey, look at me! I just got through with a Strhess and Hot Topic shopping spree! I'm such a rebel!
actual goth: Jesus, you're such an off the rack rebel!