Teen summer must-haves?

I'm going to the mall tomorrow, and since summer is just a few weeks away, I'm going to get some summer clothes. So, teen girls, I would like to know what your top ten Summer fashion must-haves are. (ex. sundress, jean shorts, etc.) And if you could give some pictures and examples, that would be great. My favorite stores are Forever 21, PacSun, and American Eagle. Thanks!(: