The white veil, appearing in Act 3 is based on an Afghan tradition of peace-making. As explained by Leila Enayat-Seraj [in Salon]:

In our tradition, women have played a major role in peace bringing: In fact, we have a tradition called ‘the white veil.’ If there’s a dispute — whether family or community or even a national dispute — an elder lady in the community who wears the veil will throw her veil down to demand terms of peace. No one can say no, and right there the conflict is solved.