I'm a high schooler (as you know), and these are a few samples from my unofficial school uniform:
Girls love their booty shorts...

...or Victoria's Secret yoga pants (despite the fact that they're clearly not headed to a yoga class) that show of those sexy camel toes and panty lines...

.
On top, they act as walking advertisements by wearing fitted logo-tees that are made in Taiwan and sold for $20 more than they're worth. The shirts are artfully arranged to show off the maximum amount of cleavage and belly that the relatively modest shirt allows.
Ugg-ly as they are, Ugg boots are incredibly comfortable.
In an effort to make themselves look as unappealing as possible, they cake on their CoverGirl foundation and line their eyes heavily. As far as hair goes, they love to straighten their hair until it's practically burned off or do the absolutely disgusting and wet-looking "scrunched" hair style.