This is a cushion cover, pillow cover, towel, or cloth.
Mikoto Misaka is ready for railgun action on one side of this cushion cover, and evidently mortified by the snug fit of her swimsuit on the other! It measures 45cm by 45cm and is made of 100-percent cotton for durability; just add a cushion form of the correct size, and you have a comfy pillow that's perfect for napping or pampering your favorite housepet!