I can't wear lambswool on the skin at all due to itchiness. Cashmere I can deal with, but then again, I don't see any time when I'd be wearing nothing but a cashmere sweater. Especially if it's a v neck
Many people have trouble with one wool or the other ... thankfully, I can wear any most kinds of wool on my skin and be okay. The only time I had this itchiness issue was with a cheap lambswool sweater that I had years ago. I had to give it away.