Wool jerseys are the best, I wear them through the fall winter and spring. I love them.
However, where they really shine is in the heat of summer. A wool jersey in summer heat breathes and the sweat simply goes away. You come back from your summer rides and your jersey isn't wet - kind of nice.
Washing them is easy, I still do what I have done for 30 years. Hand wash in cool water with woolite or zero then hang them up on padded hangers.
I really always liked wool tights but sadly you can't find those anymore.