Welcome back Jo! Thanks for stopping by with your question.
I am very happy to know you will be celebrating your granddaughter’s birthday at the Walt Disney World Resort, the happiest place on Earth! I am sure your family will have an amazing experience!
Guests age 13 or under are allowed to wear costumes at Disney Theme Parks. For safety reasons, Disney have created new guidelines for wearing costumes at the parks. You can find a
list of the costume guidelines at Disney official website. Also, it has been posted recently at the Disney Parks Blog, an informative video about
Costume Guidelines for events at Disney Parks.
As we are talking about a 5-year-old little princess, wearing her royal dress for a very special occasion, I believe she will be fine. My daughter loves to visit Disney Theme Parks wearing her princess dress too!
Get ready to have lots of fun and make memories that will last for a lifetime!
Hope this helps your planning. Let us know if you have any additional questions.
Have a wonderful day!
Gina V.