It's not purely about wool but you might enjoy A Short History of the World According to Sheep by Sally Coulthard.
On a different note, I've started Butter by Asako Yuzuki, and I know it was a big thing last year or the year before but it's not really gripping me so far.
I enjoyed Butter as more literary fiction, knowing that it wasn't the crime thriller whatever it was described as. But knowing that before I started meant I approached it differently with different expectations.I found Butter hard work. The description didn’t really match the book I read and I’d have stopped reading if it wasn’t my book club pick!
So much so i've preordered their next book.