The face-off between Chola princess Kundavai and Nandini, the queen of Pazhuvur, is expected to be one of the many pivotal moments of Mani Ratnam’s Ponniyin Selvan -1, which releases on September 30. This was among the toughest portions to design and style, say the film’s costume designer Eka Lakhani and jewellery designer-stylist Pratiksha Prashant of Kishandas & Co. “Nandini …