How to Say "swimsuit" in Spanish
The Spanish word for “swimsuit” is “malla” — B1 level.

Examples
¡Vamos al río! No olvides tu malla.
Let's go to the river! Don't forget your swimsuit.
¿Dónde dejé la malla? Quiero entrar a la piscina.
Where did I leave my bathing suit? I want to get in the pool.
Me tengo que comprar una malla enteriza.
I have to buy a one-piece swimsuit.
Universal Gender
In regions where this means swimsuit, it is used for both men's trunks and women's suits, but the word itself remains feminine.
Regional Choice
If you are not in the Southern Cone, use 'traje de baño' to be safe, but you will be understood everywhere.
Assuming it means leggings everywhere
Mistake: “Asking for a 'malla' in a clothing store in Mexico expecting pants.”
Correction: In Mexico, they might point you to the swimsuits or be confused; ask for 'mallas' (plural) or 'licras' for pants.
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