Folks, I think one of the problems with stating personal preferences like in this thread as if they should work for everyone, can be illustrated by a statement made by a English army commander in the earlier 1800's. In today's vernacular it goes something like 'In general, all generalities are false, including this one'.
Years of research by the US Armed forces and more recently fine companies like Sitka and First Lite can show the key to keeping warm or cool is how we manage what they call 'our micro-climate'. This is the climate that exists between your skin and outermost layer of clothing you are wearing at the time. An example. If you sweat and have no means to let the moisture from your skin escape to the atomosphere, your micro-climate will have a high humidity. It's scientific fact the wettter the atomosphere the harder it is to keep the human body warm or cool, depending on the season. Just think about how you feel in the summer when its 90 degrees and 90% humidity. Hard to cool down since our sweat cannot easily evaporate from our skin which is our main source of cooling. In the winter, high humidity in our micro-climate has a lot of moisture being held next to our skin and water can conduct the heat out of our bodies more quickly than dry air. So staying warm in cold weather can be tough if our micro-climate is too wet.
Studies show it's key to keep our micro-climate under 40% humidity. The problem is no two people perspire the same whether we're sitting on a stand, still hunting, or moving briskly. We each have to find the right combination of materials to wick the moisture off our skin and let most of it pass to the atomosphere without letting wind penetrate and chilling us.
Sounds to me like Roger has found a system that works for him consisting of various layers of wool depending on outside temp.
It also sounds to me like Pistol Pete has not been able to find a system of wool layers that does the job for him. But has found other traditional materials that do work.
Others, like SteveO have found some of the modern material systems like Sitka, do a better job for him than anything else.
From where I sit, they are all right in terms of works best for them individually. The problem begins when we each take individual solutions that work well for us, and 'generalize' they should work well for everybody. I think it's far better, factually, and less likely to be wrongly interpreted if we preface our statements with something like, 'this is what works for me'/
As the EPA says on all mileage estimates, 'Your mileage may vary."