Hello Matt!
Thanks for stopping by the Disney Parks Moms Panel. I have so many fond memories of magical transformations with my daughter at
Bibbidi Bobbidi Boutique. The Fairy Godmothers-in-Training do a fantastic job of making every child feel like they've stepped into a Fairytale. I hope you make unforgettable memories with your little one.
The Ariel costume I last saw as part of the Castle Package was a ball gown type costume. Much like the pale blue/green dress Ariel wears when she greets Guests at
Cinderella's Royal Table during breakfast. Matt, keep in mind you are more than welcome to bring your own costume from home. Often I would bring my child's favorite costume in a bag and let her change into it at the Bibbidi Bobbidi Boutique. She still got the full transformation experience but with a costume I knew she loved to wear and was comfortable for her to walk around in all day.
I hope this has helped. If I can answer any other questions you may have about traveling to The Most Magical Place on Earth, please let me know.
Have a Bibbidi Beautiful Day,
Jen