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Man wearing a tank top in the UK in 1974.

A sleeveless sweater (known as a tank top in the United Kingdom, a sweater vest in North America and a Langdon in the Northeastern United States) is an item of knitwear that is similar to a sweater, but without sleeves. They have been popular in the 20th century, particularly in the 1970s in the UK.

More recently the Sleeveless Sweater has seen a huge surge in popularity and is now featured frequently and worn by those considered to be super-fashionable. They are also popular among sports fans, who often wear them while playing golf. Those with Sports Team Logos (Especially NFL and College Teams.) are also popular and are frequently seen being worn by Football Coaches, most notably Jim Tressel who has been given the nickname "The Sweater Vest" by many football fans.

Many newer designs feature a return to popular patterns from eras past such as argyle. Other variations include designs of a more modern nature, including stripes.

The name Tank top, recorded in English since 1968, derives from its resemblance to a tank suit, a style of one-piece women's swimsuit with shoulder straps, so called since the 1920s, because it was worn in a "swimming tank," an obsolete term for what are now called "swimming pools." A female swimming version of the tank top, the tankini (a portmanteau of the words "tank top" and "bikini"), is also an option.

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