Got this email from Dapper Days:
NEW DISNEY PARK RULES
Many of you have inquired weather Disney's
new park security measures and rules (specifically the prohibiting of wearing costumes by anyone over 14) will end or impact our DAPPER DAY Park outings.
No, they will not. Our events celebrate great style from yesterday and today and are not, and never were, intended as costume or cosplay gatherings. Disney-inspired ensembles are always fun at our park outings, but keep in mind Disney will likely ask you to change your attire if guests could confuse you for a Disney employee or park entertainer.
We're working closely with Disney to ensure our events happen smoothly as we continue expanding our happenings at the Disney Resorts and look forward to all sorts of new activities for our followers with the Disney Company.