Square cut sports-shirts as far as the eye can see. He is practically the only adult wearing a collar. Khakis and tennies.
The kids non-PC language and the stubby beers at the end put this movie firmly in the mid 1970s. Can you play air hockey without thinking of Tatum O'Neal in the Bad News Bears? I can't. Mrs. 10e has a pretty great arm - think she identifies with this movie a little. Even rocked a blond Dorothy Hamill cut in those days... Buttermaker has the summer look down (without resorting to shorts) but might not be the best role model...