She was bottomless

Riku groaned. He knew he shouldn't have left Kairi alone, but it wasn't like he could just dress her himself. He took mental stock of her attire. On the bright side, she had finally managed to find and don a shirt, which was definitely a step in the right direction.

Unfortunately, she had also managed to lose her panties again. How did this girl usually get dressed where that was even possible?!

Still, this was good. With a shirt on, she was less likely to realize her state of undress with a casual glance down, and he was, in turn, less likely to have to waste time babysitting her. Turning to the others, Riku whispered "Remember, act like everything is normal", to which he received a chorus of nods in return.

Satisfied, Riku left to go contact someone who might be able to help, like Master Yen Sid or maybe Ienzo, leaving Sora and company to deal with the half-dressed Kairi.

So of course they screwed it up within fifteen minutes.

It was a fairly innocuous event, really. They were running around by the shore and Wakka just happened to accidently splash some water onto Kairi. Which wouldn't have been a big deal, except it hit her directly in her bare ass.

Obviously, this tipped Kairi onto the fact that she had nothing on down there. "Ahhh! Where are my pants!?"

Crap. Sora knew he had to say something, quick.