The A-Shirt
Is it because of a murder in Detroit, or Marlon Brando?
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I am more interested in why they are called "tank tops." They don't resembles any part of a tank, much less the top.
https://en.wikipedia.org/wiki/Sleeveless_shirt#Tank_top
It's because they resemble the top part of a full-body swimsuit that was called a "tank suit." Here, "tank" refers to a tank of water used for swimming (i.e., what we usually call a pool).