This outfit seems a tad impractical. You know she's going to sink in heavy seas from taking on too much water.
About as practical as any other of the shipgirls' equipment and clothing. The Standard carriers wear enough clothing that they shouldn't even be able to stay up if they get wet and Taihou is covered in metal armor.
The Yamato class' guns easily weighs over a few thousand tons and many of the battleship girls are nothing but muscles, and in the Takao's classes case; plump. The whole practically and impractical of clothing as well as regular physics don't seem to work in the Kancolle world.