Translation guide
In Japanese, the most common word for swimsuit is 水着 (mizugi). There are also specific terms for different styles, such as bikinis or school swimsuits.
The most common, all-purpose word for any swimsuit or bathing suit.
The standard, neutral word for swimsuit. Used for men's, women's, and children's swimwear.
I bought a new swimsuit.
I'll change into my swimsuit.
A two-piece swimsuit for women.
The standard loanword for bikini. Widely understood.
She is wearing a red bikini.
A one-piece swimsuit, often for women or competitive swimming.
From 'one-piece'. Refers specifically to a one-piece swimsuit. Can also mean a dress, but context usually makes it clear.
I like one-piece swimsuits.
From 'separate', but used for tankinis or two-piece suits that are not bikinis. Less common.
The standard swimsuit worn in Japanese schools, often a dark blue one-piece with a name tag.
Men's swimwear, typically shorts.
A tight-fitting swim shirt, often worn for sun protection or surfing.
The standard term for rash guard. Very common in Japan for both men and women.
I wear a rash guard to prevent sunburn.
If you're unsure which specific word to use, 水着 (mizugi) is always safe and natural for any kind of swimsuit. You can add descriptors like ビキニの水着 (bikini-style swimsuit) or 男性用の水着 (men's swimsuit) if needed.
The English word 'swimsuit' is not used as a loanword in Japanese. Always use 水着 or a specific term like ビキニ.
I'm looking for a tankini-style swimsuit.