I suggested Vermont Originals as a commercial wool beanie resource. I found Vermont Originals by way of Rivendell Bicycle Works. Several years back, Riv switched vendors from Wigwam to VO for their signature striped beanie.
I’m a fan of striped hats (grey-black is best), though I do like Riv’s solid, thin wool beanies. However, I’m waiting for Riv to cycle through their current, lt. blue and and lilac color offerings.