服の下に水着 服の下にビキニ 水着ワイシャツ Tシャツ+水着

A bikini being worn underneath clothes.

See also

• swimsuit under clothes (mostly for one-piece swimsuits)
• bikini over clothes
• bikini under shorts (if shorts are the only thing being worn over the bikini)
• bikini under skirt (if a skirt is the only thing being worn over the bikini)

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