She bumps into someone, and they notice her

Jessica's clothes were on a pile just behind the back corner seat. As she was picking them up, she accidentally brushed into someone, who turned behind them just as Jessica stood all the way up.

Even though she was holding all her clothes, it was plain to see even in the low light that she was butt naked.

"Whoa..." the student could only say, as Jessica's eyes widened at the student, and at the realization that her cover was blown.