During their holy days called Mukhtad, Parsees congregate at sunrise in their fire temples and worship the spirits of their departed loved ones. After the congregational worship, individual families have their own private rituals with a priest, around a small fire in the temple. Families bring offerings of fruits, flowers, incense, wood, and money for the rituals. Rituals continue on until sunset. The last day of Mukhtad is Pateti, which is the day of repentance.
Parsees examine themselves on that day and repent of known sins.
This leads up to Khordad Sal four days later, celebrating the birth of their founder, Zoroaster. The Parsees have been seeking God and His righteousness. Those who have the true garments of righteousness have not taken these to the Parsee people. So the Parsees make their own shirts of righteousness, literally. Parsee men and women wear white shirts, called shudrehs, under their outer shirts.