How should I dress during eighth grade?

I'm a girl who has long & poofy dark brown with natural black & light brown highlights & full bangs, blue gray eyes with long curly eye lashes, rosy cheeks, red lips, large bust, average body fat, long torso, large thighs, short legs, and pretty big feet. My height is five feet & six inches and my shoe size is a womens eleven. I've out grown alot of my clothes and I don't have alot of money. I can't pay $50 for jeans or a sweater, $30 for a top, $50 for a hoodie, $200 for a snow jacket, or over $100 for shoes. I might get double ear piercings this summer. I live in a cold, rainy, place that sometimes have snow that's simular to Forks, Washington and no, I don't care about Twilight. I'm a tomboy and I like to wear clothing from these stores- Deb: A little girly and not expensive. They have a website, but my family doesn't like ordering online. They don't have many stores and I go to one of their stores at a mall near some family in another state, so I only shop their about five times a year. Hot Topic: I like their jewelry and some of their pop culture apparel. Zumiez: I mainly shop their for sweatshirts and snow jackets. Their snow jackets have alot more character than the ones from The North Face. Those are great because my area doesn't have very nice weather. Pacific Sunware: I like their sweaters, pants, hoodies, and jackets alot. Journeys: I like their rain boots, skate shoes, slippers, and laces alot. They tend to go to size twelve for their biggest womens shoe size. Niketown: I really like Nike 6.0 dunks. Levis: I've discovered that their jeans, pants, and shorts fit real nice. Also their denimis comfty. Brooks Outlet: Brooks has an outlet for their clothing next to the local super market and drug store in my town. I've been wearing their running shoes for about three years. Now for the dress code, at my school we get in trouble for low cut tops, short shorts, spaghetti straps, and short skirts. I have to walk twenty minutes to school and then twenty minutes home, so no dresses & skirts (Even with shorts or tights) or fashion boots, fashion sandals, flats, flip flops, or heels for me. I'm basically wondering how should I dress during eighth grade (at a Junior High).