The T-shirt is one of the most popular clothing items in the world, but few people think about how it got its name. The explanation is simple: when laid flat, the shirt’s body forms a vertical line while its sleeves extend sideways, creating the shape of the capital letter “T.” This basic design inspired the name that has remained unchanged for generations.

T-shirts first became popular in the early 1900s, when they were mainly worn as undershirts rather than as everyday clothing. The United States Navy provided lightweight cotton shirts to sailors because they were comfortable, breathable, and easy to wash. At the time, wearing one alone in public was generally not considered appropriate, as it was meant to be worn beneath a uniform.

As time passed, factory workers, farmers, and other laborers began wearing T-shirts on their own, especially during hot weather. Their comfort and practicality made them an ideal choice for physically demanding work. However, it was Hollywood that helped transform the simple garment into a fashion statement.

During the 1950s, actors such as Marlon Brando in A Streetcar Named Desire and James Dean in Rebel Without a Cause made plain white T-shirts look stylish and rebellious. Their popularity grew rapidly, turning the once-basic undershirt into a symbol of confidence and youthful independence.

By the 1960s, T-shirts had become a way for people to express their personalities, with printed slogans, artwork, and band logos becoming increasingly common. Today, they remain a wardrobe essential worldwide because they are affordable, comfortable, and versatile. Despite their evolution from military undershirts to fashion staples, their name still reflects the simple shape that started it all.