Maybe the character, when realizing they are stuck in the sexy costume, tries to imitate different animals that might get stuck in small spaces. For example, wiggling like a worm or hopping like a bunny while still in the costume, which would be quite hilarious.
One idea could be a character getting stuck in a glamorous evening gown before a big event. She has to enlist the help of a charming stranger who is initially attracted by her 'trapped' situation but then discovers her real charm beyond the sexy costume.
One year, my wife decided to be a witch for Halloween. She had a long black dress with a deep V - neck and a flowing cape. The dress was cinched at the waist with a red belt. She put on a pointy hat and carried a broomstick. When we went to the Halloween party, everyone was charmed by her look. She looked both spooky and sexy at the same time. The way the dress moved as she walked added to the allure.
Obviously, Ash would be the main character as he is the one stuck in the costume. His Pokémon like Pikachu, Bulbasaur, and Charmander could also be important characters. They could be the ones trying to help Ash get out of the costume, using their different abilities.
Perhaps Ash is at a Pokémon festival and gets stuck in a traditional costume. He then has to go on a mini - adventure within the festival grounds to find someone who can help him out of it. Along the way, he meets new Pokémon and trainers, and they all work together to free him. This could also be a chance for Ash to learn more about the local Pokémon culture.
There was this neighbor who always liked to be a bit different. For Christmas, she wore a costume that was a combination of an elf and a snow queen. Her dress was silver with green accents. It had a short skirt made of tinsel - like material that sparkled in the light. She had on pointy elf shoes and a crown made of icicles. She made the whole neighborhood feel like we were in a magical Christmas wonderland.
Once upon a time, for Halloween, a wife decided to dress as a glamorous witch. Her costume was a short black dress with a deep V - neck, purple lace trim, and a pointed hat. She paired it with fishnet stockings and high - heeled boots. When she walked into the Halloween party, all eyes were on her. Her husband was both proud and a bit jealous as she charmed everyone with her confident and sexy look.
It could be about someone who is 'stuck' during Christmas. Maybe they're stuck in a snowstorm and have an adventure trying to get home for Christmas. Or perhaps they're stuck in a small town and discover the true meaning of Christmas there.
One idea is that a child is stuck in a Christmas tree lot. He got lost while his family was picking out a tree. As he's stuck there, he befriends the lot owner and learns about the hard work that goes into getting Christmas trees ready for families. In the end, his family finds him and they have a great Christmas with a special tree.