Have a ticket for Mickey’s Not-So-Scary Halloween Party at Magic Kingdom Park? Let’s go over Walt Disney World Resort’s costume rules for the special event, which is one of the only times guests 14 and older can dress up at the Central Florida Disney parks.Walt Disney World Resort’s Rules for Halloween CostumesCredit: DisneyThe official costume guidelines for Mickey’s Not-So-Scary Halloween Party guests differ significantly from the standard Disney dress code. Walt Disney World Resort allows guests 14 and older to dress as their favorite characters for the event, but it still has strict rules that anyone dressing up must follow.1. No Acting or Posing