"They wear jeans or shorts"
Is that a joke? Pretty much every single person i see in my school wears jeans or shorts.
I never ever wear either jeans or shorts, so I was pleased by that part
The extreme geeks wear grey short shorts with suspenders and a short-sleeved shirt tucked into 'em. Also tall black socks and formal-looking shoes. They typically come with a bowl cut, braces, and glasses the same size as their face. They have an awkward smile, like they'll come after you in your sleep. Oh, and you'll never see a geek without an analogue watch on his wrist either. Geeks tend to be around average height or slightly shorter, but not always.
(Nearly everyone I've ever met wears jeans, but I suppose that would include both geeks and non-geeks.)