Ah, the trusty Submarine loadout.

A reappearance of the delightful Ryuujou swimsuit booty.

That's a good look for her.

While frilly certainly suits Ryuujou, School Swimsuit is the way to go!

School swimsuits or competition ones would fit that little carrier well. It accents her right places, and especially compliments her cute flight deck.

The Admiral approves of said suits. Even Battle Submarine Haruna is alright with it.

If she doesn't want the frilled bikini or the sukumizu, she should go with the three bandage bikini.