Their uniforms really aren't made for massive chests. For not noticing that the button flew off, she's even more oblivious than I previously thought. Amano is in a different league of missing details, as far as her underwear/boobs/booty goes.
@Simkin The usual pattern with this subject is that the have nots want it, and the haves don't because it's not like it doesn't come with its own set of problems, and the grass is always greener on the other side.