If you are in disguise, you are not wearing your usual clothes or you have altered your appearance in other ways, so that people will not recognize you. 伪装
verb [vt. 及物动词]假扮,伪装;掩饰,隐瞒
She disguised herself as a man so she could fight on the battlefield. 她把自己装扮成男性,以便能够在战场上作战。