The History of the Tank Top

The word has nothing to do with armour, and nothing to do with the shape of the thing. A tank was a swimming pool. For most of the last century the garment named after it was not meant to be seen at all. Its history is largely the story of a piece of underwear that kept walking out of the front door.

Named After a Swimming Pool

In the early twentieth century, an indoor swimming pool in America was commonly called a swimming tank. The one-piece sleeveless costume worn in it became the "tank suit" in the 1920s. When the upper half eventually separated and went its own way, it kept the name. The compound "tank top" is first recorded in 1968, which means the garment is roughly half a century older than the word we now use for it.

What makes this more than trivia is that other languages arrived at the same idea by different routes. The Italian canottiera derives from canotto, a small boat — it was the shirt worn by rowers, cut away at the shoulder so the arms could work. The French débardeur is a dockworker, the man who unloads the boat.

Three languages, three names, and every one of them points at water and physical effort. Nobody named this garment for how it looked. They named it for what you were doing while you wore it.

The Undershirt Century

The object is considerably older than the name. In 1868 a one-piece knitted undergarment was patented in Utica, New York, under the title "emancipation union under flannel". It came out of the Victorian dress reform movement and was intended for women, as an alternative to corsets and layered petticoats. Men adopted it quickly — labourers and farmers above all — and it became known as the union suit.

Then it began to come apart. Two-piece underwear was easier to launder and far better in warm weather. By 1914 B.V.D. was selling a sleeveless union suit with quarter-length legs, and through the 1920s the style was marketed as the athletic union suit, so named because it resembled what athletes already wore. The logic was subtraction: remove the sleeves, and you remove the heat.

The military finished the argument. Sailors had been wearing their issued undershirts on their own for decades when at sea, where the work was hot and the uniform was not. In 1913 the US Navy formalized the undershirt in its regulations. That version was short-sleeved rather than sleeveless, but the principle had been established — the layer underneath could be a layer on its own.

Why the Rib

Pick up a well-made tank top and the first thing your hand registers is not the cotton. It is the ribbing.

A rib knit is made by alternating knit and purl stitches across the fabric, which pulls the surface into vertical columns. Those columns fold against one another at rest and open under tension. The result is a fabric that stretches sideways far more than it stretches lengthways, then returns to where it started.

That property is why the underwear industry reached for rib long before elastane existed. A ribbed shirt could sit close to the body without being cut tight, follow the torso through movement and recover its shape by the end of the day. The vertical channels do something else as well: they hold a thin layer of air against the skin, which is why the same construction works in July and in January.

Double rib, as we use it for the FRNKOW Tank Top is simply more of this: two raised columns on each face rather than one. More yarn and more structure, and a longer memory for its own shape.

The Day It Went Outside

The tank top's reputation was never really about the tank top.

In New York, in summer, Italian and other immigrant labourers wore the undershirt outside their trousers and left the shirt off altogether. It was a practical decision — one less layer to sweat through, one less thing to wash — but it made the garment legible as a class marker.

By the 1950s that reading had hardened. Cinema cast the sleeveless undershirt on brutal men, and Marlon Brando's Stanley Kowalski in the 1951 film of A Streetcar Named Desire is the version everyone still pictures. American slang went further and attached a nickname to the garment that tied it directly to domestic violence. The association held for decades.

The rehabilitation came from outside the mainstream. Through the 70s, gay men in New York and on Fire Island wore the tank top as outerwear deliberately and without apology, while athletics had kept the singlet respectable the whole time. By the point the garment reappeared in European fashion, the question of whether it belonged indoors or outdoors had quietly been settled by people who never asked permission.

What a Hundred Years of Knitting Knows

There is a reason this garment has never been meaningfully redesigned. Subtract the sleeves and knit the body in rib, then finish the openings so they keep their shape. The specification has been stable for about a century because it was right the first time.

The FRNKOW Tank Top is knitted in Germany by a family-run manufacturer that has been making underwear for more than a hundred years, which is to say, for almost exactly as long as the garment has existed in its modern form. The body is circular-knitted, so there are no side seams to sit against the ribs. It isn't an interpretation of the archetype. It is the archetype.

So the next time you pull one on, look at the armhole. A well-cut one lies flat along the shoulder and doesn't gape when you raise your arm, the same test a rower would have applied in 1900.