The no 64 tshirt harris is made from an extremely soft cashmere from inner Mongolia (and a bit of stretch). This Extreme Cashmere jumper looks like a Tee, has a round neckline, and somewhat wider sleeves.
Cashmere is a natural product and requires special care. Have you worn an Extreme Cashmere item for one day? Then give it two days of rest. Washing is possible, but only on a wool program. Put the jumper folded in the closet, so the cashmere keeps its original shape.