Human: I'm interested in learning about the history of the tee shirt. Assistant: 
T-shirts have been around for centuries, and their origins can be traced back to ancient Greece where they were worn by athletes and soldiers as early as 400 BC. In the 18th century, cotton was spun into thread and woven into fabric that could be cut and sewn into shirts. During the 19th century, the Industrial Revolution saw a huge increase in mass production techniques which led to more affordable clothing options such as t-shirts. By the 20th century, t-shirts had become a staple of everyday wear, with many different styles and designs available. Today, t-shirts are still popular, and there is a wide range of materials, colors, prints, and patterns available.