1) Beachwear portmanteau 2) Modest two-piece bathing suit 3) Modest two-piece swimsuit 4) Sort of two-piece suit 1) Swimsuit 
The tankini is a bathing suit combining a tank top, mostly made of spandex-and-cotton or Lycra-and-nylon, and a bikini bottom introduced in the late 1990s. This type of swimwear is considered by some to provide modesty closer to a one piece suit with the convenience of a two piece suit, as the entire suit need not be removed in order to use a toil...
A two piece bathing suit with the upper portion resembling a tank top.
A two piece bathing suit with the upper portion resembling a tank top.
A two-piece bathing suit with the top resembling a tank top.