I have had a sweater and a sports coat made of Alpaca. It is very comfortable, not scratchy, and works in a wide range of temperature. It is like turbo charged sheep wool.
Musk ox wool is the best there is.
I have a kick ass alpaca sweater, real warm but real itchy. As far as musk ox, I wanted a musk ox sweater, and when I made it to Anchorage back in 1980 I had to make a stop in the Quiviat Store that I had seen advertised in the Alaska Magazine. I went in the store and it was all frilly women's stuff, shawls and scarfs mostly, not one rugged gnarly musk ox looking sweater of any kind. When I inquired I was told that the yarn from the musk ox isn't strong enough for sweaters.
I've probably worn out more wool clothing than your average guy has ever owned. Pants and shirts anyway, I haven't killed any sweaters that I remember. Wool shorts (cut off military) are my main tripping pant. When the elbows wear out of my shirts I turn them into sleeveless and short sleeves. I used to layer with the sleeveless one against the skin, a short sleeve over that followed by a long sleeve.
I still wear a wool hat that I bought 40 or so years ago that had a revolutionary new waterproof breathable material in it, Gortex. The wool is still going strong but I think the gortex disintegrated.