White swimsuits get transparent in the ocean.

Almost certainly not. Even if the fabric is thick and lined, saltwater and movement create the perfect conditions for a reveal. Think of it like white cotton and a glass of water—wet fabric loses opacity.

A few things work against you: the fabric stretches when wet, light bends through water differently, and most white swimsuits aren’t built for full coverage when saturated. Even expensive, lined suits can go sheer in direct sunlight.

If you absolutely want white, test it in a pool first. Or look for a white suit with a nude or black lining that matches your skin tone. But honestly? I’d save the white for the beach towel and wear something darker in the water.

Future you will thank you for avoiding the surprise.