This is called the "kisi.

The dance is supposedly a religious one, in honor of the Rain God, and at first the snakes were not used, but as the dancers became wrought up and excited by their antics one by one they reached within the kisi and drew out a snake, allowing the reptiles to coil around their almost naked bodies and handling them with seeming impunity.

Very quietly his master spread his own sleeping-tunic (kisi) over the dog, and crept away, leaving him asleep in the warm place.