The word pushmina can be transliterated and its meaning can be explained in the footnote. Its a conceptual word and substituting it with a specific word in the target language is not advisable.

Cashmere is the animal-hair fibre forming the downy undercoat of the Kashmir goat. Although the word cashmere is sometimes incorrectly applied to extremely soft wools, only the product of the Kashmir goat is true cashmere.
The fibre, known as pashm or pashmina in some parts of Asia, became known for its use in beautiful shawls and other handmade items produced in Kashmir, India.
The major producers of cashmere are China, Mongolia, and Iran. Cashmere is also produced on the Indian subcontinent and in Afghanistan and Turkey. The United States, the United Kingdom, and Japan are leading consumers.

pashmina(a variety found in kashmir(india) ,afganistan)
its very fine soft wool.pashmina wool and shawl are very poular all over the world.