By the 1920s,the t-shirt had become an official word in american english and was included in the merriam-webster dictionary. By world war II,both the T-shirt as a standard piece of underwear. Initially the T-shirt was worn exclusively as an undergarment,but that changed in the 1950s.The fame of the T-shirt skyrocketed when actors John Wayne,Marlon Brando,and James Dean wore their underwear on the big screen.In 1951,Marlon Brando caused a sensation in his film A streetcar Named Desire when his T-shirt was ripped off his body to reveal his naked chestz then James Dean made the T-shirt acontemporary symbol of rebellious youth in the movie Rebel without a cause.it became fashionably cool to wear it as an outer garment