Dress in a varsity jacket if you have one. Nothing promotes team spirit like a wall of athletic jackets bearing medals. If you don't own a school jacket, consider borrowing one from a football player during the game.
Choose warm-up sweats in team colors. They're comfortable and durable, as well as easy to wash. If you live in cooler climates, they're also warm enough for the chilly weather conditions often accompanying football season.
Sport a school hat representing your team. Many high school athletic departments sell team hats using school colors and logos. (In addition, your purchase can help support the sports program.)
Look for accessories that compliment your outfit. Decorate white athletic shoes with laces in your school colors. Wear hair scrunchies or ties in matching colors. Even earrings or sunglasses in the right shade can add to the look. Dress as creatively as you can.