Teddy Boy (also known as Ted) is a British subculture typified by young men wearing clothes that were partly inspired by the styles worn by dandies in the Edwardian period, which Savile Row tailors had attempted to re-introduce in Britain after the Second World War.

It is sometimes inaccurately written that the Teddy Boy style and phenomenon appeared in Britain during the mid 1950s as a rebellious side effect to the introduction of American Rock 'n' Roll music. The Teddy Boy predates this and was a uniquely British phenomenon.

The subculture started in London in the early 1950s, and rapidly spread across the UK, then becoming strongly associated with rock and roll. Originally known as Cosh Boys, the name Teddy Boy was coined when a 1953 Daily Express newspaper headline shortened Edwardian to Teddy.

Wealthy young men, especially Guards officers, adopted the style of the Edwardian era. The Edwardian era had been just over 40 years earlier, and their grandparents, if not their parents, wore the style the first time around. The original Edwardian revival was far more historically accurate in terms of replicating the original Edwardian era style than the later Teddy Boy style. It featured tapered trousers, long jackets that bear a similarity to post-war American zoot suits and fancy waist coats.

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