She realises

Hanna stands there for a moment, her eyes closed, breathing a sigh of relief that the itch on her chest has gone, feeling her breathing slowly settle.

"Whoa, dude, check out those tits!"

Hanna's eyes snap open. She has no idea who spoke, and frankly that was the last thing on her mind. dawning horror fills her mind as she realises she's now stood in the middle of the convention, totally topless! Her hands fly up to cover her breasts, and she squeals for a moment, searching the ground for her shirt. Where was it? She couldn't have thrown it far!

But her search turns up nothing, mostly because your powers have caused the shirt to vanish off elsewhere.

Clad in just her tight yoga pants, Hanna began to run, her hands clamped tightly across her exposed bust as she dashed through the convention center, trying to work out just where she could hide.