People began wearing blue jeans during the mid-1800’s as ordinary work clothes. For decades, they were worn only by outdoor laborers, such as farmers and cowboys. In the 1940’s and 1950’s, American teen-agers adopted blue jeans as a comfortable, casual youth fashion. Young people during the 1960’s wore blue jeans as a symbol of rebellious political and social beliefs. By the 1970’s, people no longer considered jeans rebellious and expensive designer jeans had become fashionable.