If you are to attend the meeting of the Masters of Mordor in secret, you will need some way to remain hidden: a disguise.
'It will be easier to gain access to this meeting in the open air than it would be to pass the guards of Seregost, or any of the fortresses of Mordor, but that is not to say it will be a simple matter. You will need a disguise of some kind to get near to any of the Masters without their knowledge, but what sort of raiment will serve that purpose I cannot say.
'Mithrandir may know better than I, ${PLAYER}. Return to him in Minas Tirith and consult the Wizard, and I will continue to monitor Lhaereth's progress in plague-making.'
Mithrandir is in the First Circle of Minas Tirith, south of the entrance to the city.
A group of freed Nurnhoth might be found on the north-east side of the Third Circle, in Minas Tirith.
Hujâ is among a group of freed Nurnhoth on the north-east side of the Third Circle, in Minas Tirith.
The tailor on the south-eastern side of the Third Circle will be able to fashion a disguise of the appropriate size from the Nurnhoth clothes that were given to you by Hujâ.
Ayorzén has followed you to the tailor, and is now on the south-eastern side of the Third Circle, seeking to get your attention.