"Modify" the rest her outfit

To cause an "accident" to happen later, I cut the sides of Chiaki's skirt, the cuts were small enough that the skirt wouldn't fall but the cuts would grow the more she moved around. Then I loosed the buttons on her shirt so they would fall off later.

Perfect, now all that I need to do is to button up her shirt, act like I just walked into the classroom and hope she doesn't notice her missing bra and panties just yet. Though it would be fun walking around with a girl who's constantly embarrassed over her missing underwear but has to act fine.

Whatever happens next, I need to follow her to see how things go and to let the fun unfold.