Dreaming of a disguise means you are hiding something and not ready to reveal it to the world yet. If you truly fear being found out by someone then take the extra precaution necessary to avoid being discovered.
Disguise in a dream signifies an aspect of self-deception, insecurity, or imagination. It is also a sign of illusion, false belief, and falsehood.
In dreams where there are disguises present, it is typically because the individual is hiding something from themselves or others. This might be feelings about one’s self-image that are too hard to bear to acknowledge or face. One might have a false belief about oneself which needs to be corrected by the dreamer before one can heal psychologically.
Keeping what needs to be hidden remains hidden is the name of the game.