More fashionable clothing than the geeks gives the audience an insight on which standing they may have at school.
Shows who is who. I.e. the freaks are standing behind where it says freaks, and the geeks are standing behind where it says geeks. These two groups are isolated from the rest of the school, or labelled and not accepted.
Says in the title who the main characters are/ who the series will be about. Lockers give it the feel that it’s in school.