Srila Bhaktisiddhanta Sarasvati’s South India Tour.
He said that previously the upavita was not used, only the dhoti and upper cloth, but later it became acceptable for brahmanas to wear an upavita instead of an upper cloth. When the Bengali devotees expressed surprise that South Indian brahmanis wore their saris with a kaccha, Srila Sarasvati Thakura stated that this was the correct Vedic method.
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