Every faith insists on a specific colour to their devotees. The usual colour worn by the devotees of Hinduism in south India is “Kaavi” (light terracotta shade), but many faiths insist on White, some specify shades of off-white and a few red (like here). Many Christians wear white for their Sunday prayers.

Here you see a section of devotees back from their worshiping place and relaxing at Vandalur Zoo.