Tussar Silk Saree — The Wild Silk Elegance. Tussar silk (also spelled Tasar, Kosa, or Tusser) is produced mainly in Jharkhand, Bihar, Chhattisgarh, Odisha, and West Bengal. Tussar silk is coarser than mulberry silk, but it has a unique, rich texture that feels crisp yet soft. It is lightweight and very comfortable to wear, especially in warmer climates.