Naag Panchami~नाग पंचमी - Reason for wearing new clothes and ornaments on Nag Panchami
Nagdev was pleased with the grief of Satyeshwari for her brother. To reduce her grief and to make her happy he then gave her new clothes to wear. He also decorated her with various ornaments. On that Satyeshwar was satisfied. Hence on that day females wear new clothes and ornaments.