An important advice on taking care of your fine yak down/cashmere luxury-line items:
Always remember: The luxury items require Gentle Handling!
NEVER wash in washing machine and NO dryer!
Small hint: The Mongolians, who are avid users of their cashmere garments (from a head to toes) either bring their favorite garment pieces to the special cleaning service points or wash gently (or to be precise, rinse) in a luke-warm water (almost cold water) with a baby shampoo.