Boo to you, Michelle!
Half the fun of experiencing any Halloween-themed after-hours event, like Boo Bash, is dressing up as your favorite Disney character.
Michelle, guests of
Disney After Hours Boo Bash can enter the parks at 7:00, and that is the time that
costumes are allowed.
Guests who are planning on visiting the parks in the morning generally either head back to their resort to change or bring their costumes with them. Speaking from personal experience, Florida can be extremely hot in late October, so I do not think that wearing a costume for the full day would be as fun as it sounds.
If you do not want to head back and change or bring a change of clothes with you, you can always do a little Disney Bounding. Disney Bounding is where everyday guests give a nod to their favorite characters through their regular wardrobe.
I hope that this answered your question, Michelle!
Happy haunting!
Sarah B.