They don't fit in, they only try to. They pretend to be trendy. A pretrender is simply a cheap replica of a fashion magazine cut out. They just can't seem to get the look right.
They enjoy playing dress up with their older sister, and grandma's jewelery, and like mixing era clothing, and wearing mismatched clothes.
They often carry full packs of cigarettes, and lighters in their pockets, even though they don't smoke, it's part of the look.
Boy: Ummmm, I have the same one...
Girl: OH GOD NOT YOU TO!
Boy: What are you talking about? *takes an invisible puff off of unlit camel"