Ask her to take off her bra and panties.

You whispered to Matt that you wanted her to take off the rest. He hesitated a moment before speaking to Jessica. He was just as excited as you were.

"Even though you've taken off your dress, you still feel very hot. You don't have your swimmers with you, but noone is around. You could just take off your bra and panties." He spoke quietly to her.

"Take off.. bra and panties..." Jessica hesitated and made no motion to act any further.

"But you don't need to." Matt said quickly. You saw Jessica sigh softly in relief.

He looked at you and shook his head, then whispered. "Don't want to push our luck. If she really doesn't want to, then she might snap out of it."

You nodded.

You decided to leave it there, but you're excited about this new experience. You want to do more, but can't do more today... So you ask Matt...