human
I'm interested in learning about the history of the tee shirt.
assistant
Tee shirts have been around since at least the early 20th century, when they were made from cotton fabric and had a collar and sleeves. In the 1950s, the first mass-produced tees were made of synthetic fabrics like nylon and polyester. The 1960s saw the rise of the hippie movement, which popularized tie dye and other psychedelic designs. By the 1970s, the "tank top" became popular as a casual alternative to a button up shirt. Today, tees are worn for a variety of activities, including sports, workouts, concerts, and everyday wear.