For mild weather I just wear a wool shirt, but for the colder stuff the grade of wool makes a pretty big difference. The camo wool slicker,as pictured above, that I bought from Paul b. years ago is still going strong and with a light yearly lanolin treatment, it will shed rain all day and it is fairly wind proof. Then when we start with the Filson shirts pants and coats, that is in its own class for taking on diverse conditions.
In the northern half of the country, many of us have many bows to deal with, hundreds of arrows, some spend thousands on leases and then scrimp for the cheap stuff at WalMart and suffer for it when things get damp or when the first cold snap hits that starts the rut. One good bow is all that is required, but you just have to have a variety of suitable weight garments to match conditions and I have found that nothing covers as wide a temperature range and wet range as well as wool. I wear the same thing when it is 70 out as I do when it is 50, try that with cotton or heavy poly blends, you will be chilled to the bone and ringing wet underneath.