Final answer:
In the 1930s, children started wearing blue jeans as everyday clothing, which became a symbol of nonconformity and rebellion by the 1960s.
Step-by-step explanation:
Beginning in the 1930s, children wore blue jeans as play and everyday clothing. The popularity of blue jeans began to rise as a result of cowboy movies and dude ranch vacations.
Their durability made them a practical choice for children's clothing. By the 1950s, blue jeans were also adopted by youths as a sign of rebellion, echoing the nonconformist attitudes of stars like James Dean.
In the 1960s, jeans then became a uniform of radicalism and nonconformity, further democratizing fashion across gender and class lines.