The document discusses the history and types of t-shirts. It provides information on the origins of t-shirts as undershirts for men in the early 20th century. It details how t-shirts became popularized by soldiers during WWII and then became a symbol of counterculture in the 1960s. The document outlines the main types of t-shirts as plain, graphic, or statement t-shirts and provides tips on designing t-shirts, including choosing a concept and using high-quality materials.