Skandapurana 16.24.123

16.24.123

bhaktiyogena cāsthāya vrataṃ pāśupatādikam ..
śmaśānavāsino nagnā apare caikavāsasaḥ .. 123 ..

Resorting to the Pāśupata and other vows through the yoga of devotion,
some dwell in cremation grounds, naked, and others wear a single garment;