Kosa silk is a type of silk

Silk

Silk is a natural protein fiber, some forms of which can be woven into textiles. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity...

 made from a thread produced by a worm similar to the silk worm
which is basically produce in central india

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 in Chattisgarh region.Kosa silk is known for its comfort and popular in other countries.Bilaspur,Raigarh,champa of chattisgarh are known for kosa silk and its produce by Dewangan

Dewangan

Dewangan is a Chattisgarhi caste of weavers of silk and fine cotton cloth....

community.