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Why Are Undershirts Called T-shirts? (The Simple Geometric Answer You’ve Always Wondered About)

Ouadie RhabbouronJuly 20, 2026

The US Navy Connection (The Turning Point)

During the Spanish‑American War (1898) and continuing through World War I, the US Navy issued these short‑sleeved crew‑neck undershirts to sailors. They were breathable, comfortable, and easy to move in – perfect for under a uniform.

But sailors being sailors, they started wearing them on their own, especially in hot weather or off‑duty. When they needed to refer to the garment, they described it by its shape:

“Hand me that T‑shaped shirt.”

The name was casual, descriptive, and unofficial – but it stuck.

By the 1920s, “T‑shirt” had entered the American lexicon as a term for a short‑sleeved, crew‑neck undershirt.

The Oxford English Dictionary Takes Notice (1930)

The OED first recorded “T‑shirt” in 1930, defining it as:

“A short‑sleeved, collarless undergarment of cotton, having the shape of a T when laid flat.”

The name was now official. But the garment was still considered underwear – you wouldn’t wear it in public unless you were at the beach, doing manual labor, or in the military.

That was about to change.

World War II: The T‑Shirt Goes Public

WWII was the turning point. American soldiers and sailors wore T‑shirts as standard‑issue undergarments. In hot climates – North Africa, the Pacific – servicemen often worked in just their T‑shirts and trousers. Photographs from the war show them wearing T‑shirts as outerwear.

When millions of veterans returned home, they brought their comfort with them. They wore T‑shirts for mowing the lawn, playing catch, fixing the car. The T‑shirt had crossed the line from underwear to everyday casual wear.

The 1950s: Marlon Brando and James Dean Make It Cool

Pop culture sealed the T‑shirt’s fate.

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