The story
A 2/26 Nm cashmere knitted at 12 gauge on a single end, fine enough to wear under a jacket and light enough to keep on once the jacket is off. The part worth knowing is the care: this one washes at home, at 20°C on a wool cycle, in a bag, dried flat. Washing is also what softens cashmere over time. It will pill where it rubs, at the collar and under the arms, and a fabric comb takes that off in a minute.

