Chunky purl-stitch knit with a thick, textured hand and a loose, oversized drape — the ribbed cuffs and hem are the only fitted points, so the rest moves freely. Hand wash cold or use a wool-safe machine cycle in a mesh bag, then lay flat to dry; the loose weave loses its shape quickly on a hanger or in a tumble dryer, and heat can felt the purl stitch, making it stiffer and smaller than it started. Avoid wringing it out — press the water away in a towel instead — and store it folded rather than hung so the shoulder seams and wood buttons don't take on stretch marks over time.