disguise-n; 3 Senses

Sense Number 1: a costume that provides a pretend identity

Commentary: DISGUISE[+artifact][+costume][+pretend][+identity]

This eye patch, dagger and kerchief are part of John's pirate disguise.
In operas, characters often wear disguises to masquerade as other characters.
Even in her disguise as Cleopatra, I still recognized Mary.

WordNet 3.0 Sense Numbers: 2

Sense Number 2: a state of pretending to be someone, something else

Commentary: DISGUISE[+state][+semblance][+outward][+pretense]
NOTE: focus is on a result or state of pretense, not an activity

The kids thought the man was a narcotics agent in disguise.
It was actually a blessing in disguise. (somewhat figurative extension)
He threw off his disguise of aloofness and showed his real passion for the project.

WordNet 3.0 Sense Numbers: 1

Sense Number 3: the activity of pretending to be someone or something else

Commentary: DISGUISE[+activity][+ongoing][+pretending]
NOTE: focus is on ongoing activity

Rows of small children looked at her without disguise.
His government has engaged in too many disguises and subterfuges to be believed now.
Her deferential behavior towards the boss was a disguise that fooled no one in the office.

WordNet 3.0 Sense Numbers: 3