Different?

"You really can't tell?" Karyn asked, with a big grin on her face. Jon looked around the room carefully. Everything looked exactly the same. Patting himself down revealed no changes either. "I don't see any differences at all." Jon said. "What did you do?" "I'll give you a hint. There's a difference in your outfit.", Karyn smirked. Looking down at himself, Jon took a careful inventory. 'Same white blouse, same plaid skirt, same mary-janes with knee socks. It was the same schoolgirl outfit he always wore. Moving to stand in front of the mirror, Jon twisted and turned but nothing was apparent. "I still don't see a difference. How about another hint." Jon asked.