Vintage Cowichan Sweater Size Medium/Large Beige Full Zip Cardigan Aztec Knit

The sweater is pre-owned and has cosmetic pilling from use/age, but it's still in good condition without any rips or holes. It's missing a materials tag, so I don't know what it's made from. It's missing a size tag, but measures as a M/L (approx 19 inches pit to pit and 28 inches length). Please look at all of the photos and ask any questions before buying. Thank you!