Vestment and Iconography
As a liturgical vestment, the girdle, also known as a cincture, is a long, rope-like cord tied around the waist over the alb.
In the Vajrayana iconography of the Hevajra Tantra, the 'girdle' (Tib.: ske rags), one of the 'Five Bone Ornaments' (aṣṭhiamudrā) symbolizes Amoghasiddhi and the 'accomplishing pristine awareness' (Kṛty-anuṣṭhāna-jñāna), one of the 'Five Wisdoms' (pañca-jñāna). The iconography of the girdle (or bone apron and belt ) in Vajrayana iconography developed from one of the items of vestment adorning the Mahasiddha of the charnel grounds.
Beer (1999: p. 318) describes the bone girdle as the 'netted bone apron and belt' as vesture of the Dakinis and Heruka of the Cham Dance and Gar Dance of Tibetan Buddhism sacred ritual dance performances:
The bone ornaments worn in these ritual dances are exquisitely carved - especially the netted bone apron and belt, which are commonly adorned with intricately carved images of dakinis.
Read more about this topic: Girdle