Whatever's comfortable - it's high school... When I was in high school, it was a t-shirt or polo with jeans/ khakis. Most of the t-shirts I wore were free from events and such. In colder weather, it was either a sweatshirt or varsity jacket. For shoes, sneakers most of the time with an occasional loafer. Whatever you do just don't buy stuff from abercrombie...
I assuming you go to a public high school (thats one of the only redeeming qualities of my school, the freedom of expression through what you wear) I agree with hanker565. Wear anything you like, it makes you who you are. And I agree, don't limit your clothes to one brand, especially Abercrombie.
1) your high school time would be best spent learning English and how to write/communicate without making up words as you go along.
2) you are in the wrong place asking for advice, as you are
-most likely not financially able to dress in the styles advocated here
-most likely going to be an outcast by showing up in HIGH SCHOOL in a jacket/collared shirt/pants/leather laced shoes
-likely going to have your particular sexual leaning called into question