It appears Disney has posted a policy update.
I have reviewed the party information in the past and it was fairly vague.
This is very specific.....
Costume Guidelines
Guests under the age of 14 may dress in their favorite Halloween costume and must follow at least these guidelines.
Costumes Should
Costumes Should Not
- Be obstructive, offensive or violent
- Drag on the ground
- Contain sharp objects, pointed objects or materials that may accidentally strike another Guest
- Contain any weapons which resemble or could easily be mistaken for an actual weapon
Masks
- Masks may be worn by Guests under the age of 14, but they must not obstruct vision and eyes must be visible at all times
Know Before You Go
- Please be sure costumes meet these guidelines
- If a costume cannot be modified, a Guest may be refused entry into the event
- Guests under the age of 14 may dress like Disney Characters, but they may not pose for pictures or sign autographs
- Guests may not wear a costume to a Disneyland Resort Halloween event unless they have a valid ticket to that event
You might want to call and see what Guest Services has to say.
However, reading this looks like they have made a major change.
Geemo