They have some plans

Last night, Sam had discovered her mom sleeping in her night shirt and panties when she had gotten up to use the toilet in the middle of the night. She saw the wet clothes in the washer and got an idea. She knew her mom was a heavy sleeper and prone to forgetting things. So, she easily stripped her mom and buried the garments under the pile of damp ones. She then made sure to tuck her in and turn off her bedroom light before going back to bed, ensuring her mom wouldn't wake up prematurely.

Lacey and Sam at first had been embarrassed when their mom would accidentally flash in public, but now it had become a game to see how often and how long they could keep her undressed, whether she was aware of it or not. Sam had set the dryer for the maximum time, so it would still be tumbling when it came time to leave. Now they were just biding their time.

"Mom, we should probably get our things together at the front door for when the cab gets here." Sam suggested.

"Oh, sure. You and Lacey go ahead. I still need to pack my clothes once they're dry."

Lacey and Sam high fived as they left the room. They knew their mom was still fit and attractive for a woman in her early forties, so no one would complain if she had wardrobe malfunctions during the trip. As Sam took their bags to the front door, Lacey went to check on the dryer. It still had an hour left on the timer, so she set her sights on her mom's bag. She made sure she had her toiletries packed and ready. Then, she replaced her swim suit with the prank suit she and her sister had bought. If the packaging were true, it would dissolve when in a pool. With her deed done, she joined her sister. While Lacey had made the exchange, Sam ran interference.

"I need to check my clothes, Sam!" Joanne whined.

"It still has some time left. Just relax." Sam explained.