Bhagavatapurana 10.22.19

10.22.19

yūyaṃ vivastrā yad apo dhṛta-vratā vyagāhataitat tad u deva-helanam /
baddhvāñjaliṃ mūrdhny apanuttaye 'ṃhasaḥ kṛtvā namo 'dho-vasanaṃ pragṛhyatām //

19. “Since it is an insult to the gods that you in the course of the vow entered the waters in nakedness, do you join your palms on the crown of your head for the expiation of that sin and prostrate yourselves on the ground; then do you take your clothes”.