All event attendees — including adults — may dress in their favorite costume and must follow these and other guidelines: Costumes should be child-friendly and may not be obstructive, offensive or violent. Guests may wear masks.

Normally, adults (ages 14+) are strictly prohibited from wearing costumes at Disney World; however, an exception is made for Mickey’s Not-So-Scary Halloween Party. During this specifically ticketed after-hours event in 2026, adults are allowed to dress as their favorite characters, provided they follow strict safety guidelines. Costumes must be "family-friendly" and cannot contain realistic weapons, masks that cover the entire face, or ground-dragging elements (like long capes). Crucially, even when in costume, adults are not allowed to pose for photos or sign autographs for other guests, as Disney must maintain the "character integrity" of their official performers. During regular park hours, adults must stick to "Disneybounding"—using everyday clothes to mimic a character's color palette. For 2026 visitors, the "pro-tip" is to ensure your costume is practical for the Florida heat; even in October, wearing a full "Beast" or "Chewbacca" suit can lead to heat exhaustion before the parade even begins.