In the 1950s many teenage girls wore circle skirts with fitted blouses, wide belts, bobby socks and flat shoes emphasizing the hourglass shape… ETSY

Casual girl’s wear 1950s

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Some teen boys were inspired by the blue jeans and black leather jackets of Marlon Brando and James Dean.

James Dean ~ Rebel Without a Cause
Marlon Brando ~ The Wild One
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Other boys wore preppy (some said “collegiate”) sweaters over slim pants and button-down shirts

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Main source: TIMELESS AND FLATTERING TRENDS FROM 50S TEENAGE FASHION