swimsuit
n. countable A2 Elementary US //ˈswɪmˌsut// UK //swˈɪmsuːt// swim·suit
n. a piece of clothing that you wear for swimming. It is usually made of a special material that dries quickly.
n. a garment designed specifically for swimming or sunbathing. Often used as a general term for both one-piece and two-piece styles.
Don't forget to pack your swimsuit for the beach.
She bought a new athletic swimsuit to wear for her morning laps at the local pool.
Modern competitive swimsuits are engineered from hydrophobic materials to reduce drag and improve the swimmer's efficiency in the water.
From swim + suit.
Usage
Commonly used in American English; 'swimming costume' or 'bathers' are more frequent in other dialects.