What is it?

Here's a present♪

Eh? Really? Thank you! ――Wait, it's a swimsuit!

And what's with the pattern?

...that's what Haruna-san said.

This pattern is called a dazzle camouflage.

The original function of camouflage is hiding an object, but this special camouflage pattern is designed to make it hard for the enemy to accurately gauge a ship's size, speed, and bearings.