one-piece swimsuit
US /ˈwʌn.piːs ˈswɪm.suːt/
UK /ˈwʌn.piːs ˈswɪm.suːt/

1.
ワンピース水着, 水着
a type of swimwear for women that covers the torso, as opposed to a two-piece bikini
:
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She wore a stylish one-piece swimsuit to the beach.
彼女はビーチにスタイリッシュなワンピース水着を着ていた。
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Many competitive swimmers prefer a one-piece swimsuit for better hydrodynamics.
多くの競泳選手は、より良い流体力学のためにワンピース水着を好む。