T-shirt
T-shaped clothes, called tunics, have been worn since ancient times. The modern T-shirt came from 1800s underwear. Workers wore them in hot places for comfort. In 1913, the U.S. Navy introduced T-shirts as underwear. They became popular with sailors, workers, and young boys because they were easy to wear and cheap. By the 1920s, the term "T-shirt" was in the American dictionary.