swimsuit , also: swimming suit
swimming costume BrE , also: bathing costume BrE informal
bathing suit AmE , also: bathers AusE

That day we'd been asked to bring our swimming suits.

Ida Barton's swimming suit was a very nice one, as women's suits go.

Then you can carry your swimming suit and a towel.

Then he held up both hands: in one was a woman's black swimming suit and in the other, a man's green trunks.

There was a white swimming suit on the railing.

But she had no swimming suit, and she couldn't imagine getting in that water, naked or otherwise.

Soon the sky turns red, with another woman in a black swimming suit (who is amazed).

The soldier stripped to the swimming suit he wore under his clothing and eased into the water.

That has not stopped her from collecting swimming suits.

Which was sort of strange, considering how much time we'd spent together in our swimming suits.