Solution:About 150 years after Lord Mahavira's departure, when Bhadrabahuswami was the head of the religious order and Nand dynasty was ruling over Magadha, Pataliputra the capital city became the centre of learning and knowledge. At that time there occurred a severe famine that seems to have raged for 12 long years.During that period of shortage and scarcity, it was hard for Jain monks to observe the code of conduct laid down by the Lord. Bhadrabahuswami, therefore, decided to migrate to the South along with many followers. For those who stayed behind, it was hard to remember accurately whatever they learnt.
Venerable Sthulabhadra and most of those who stayed in the north used to cover their bodies with a plain, white cloth; while those who had migrated with Bhadrabahuswami were mostly unclad. The latter took pride in their being true unclad followers of the Lord and in due course came to be known as Digamabars which means skyclad. Those on the other side came to be known as Shwetamabars on account of while cloth that they wore.