Who gave the title "Sardar" to Vallabhai Patel?

Who gave the title “Sardar” to Vallabhai Patel?

The momentum from the Bardoli victory aided in the resurrection of the freedom struggle nationwide.
It was after Bardoli Satyagraha that Sardar Patel became one of India’s most important leaders.
While Patel credited Gandhi’s teachings and the farmers’ undying resolve, people across the nation recognized his vital leadership.
It was women of Bardoli who bestowed the title Sardar for the first time, which in Gujarati and most Indian languages means Chief or Leader.