Will cashmere shrink?
It depends! First, you should always read the instructions on your cashmere jumper.
Recently some cashmere specialists have been pre-shrinking cashmere, in order to enable customers to machine wash their sweaters at 30 degrees Celsius, or less.
Traditionally, however, you need to be much more careful with your cashmere.
Warm water will shrink a cashmere sweater, or pair of cashmere socks, to the extent that it becomes unwearable. It is advisable to wash your cashmere in cold water with a mild shampoo, or specialist cashmere detergent.