Is single-ply cashmere warm enough for winter?

Single-ply cashmere is warm for its weight and fine under a coat or blazer. In deep cold on its own it is thinner than a two-ply or heavy-gauge knit, so most people wear it as a layer.

How should I wash a cashmere turtleneck?

Hand wash in cool water with a cashmere or wool detergent, press out the water without wringing, and dry flat. Dry cleaning also works. Skip the machine and the dryer, which shrink and felt the fibers.

Single-ply cashmere pills more than denser two-ply knits, especially under the arms and where a bag strap rubs. A cashmere comb or fabric shaver removes the pills, and pilling eases after the first few wears.

How does it compare with a two-ply cashmere turtleneck?

It is lighter, softer and easier to layer, but less dense and less durable. A two-ply turtleneck holds its shape longer and is warmer on its own; this one is better for wearing under jackets.