In the mid seventies it was Hash jeans with a big star on the back pocket, and you had to have a big oversized comb w/handle sticking out of the pocket. Britannia jeans were also a favorite. Adidas and then the new Nike shoes were very cool. A little later it was Asics Tigers.
Then when I was a Senior in High School Disco was king, so the pants to wear were called "Cheeks". They were very tight Polyester bell bottoms, and you were a total dork if you wore underwear with them. Good thing I was a quasi exhibitionist.