I like merino wool for socks, and for beanie caps too. I have been using a lightweight merino balaclava in colder weather too. My biggame and upland jacket is a hooded waist length wool coat also. That's about the extent of the wool I wear in the field. In cold weather I'll layer the jacket with a midweight camo polar fleece jacket underneith. Overall I find that these days there are too many less expensive alternatives to wool, like various types of polar fleece, stretch polyesters, windproof fleece, etc. Actually for my lower outer layers I prefere heavy canvas duck like the stuff from Carhartt or Dickies. My main hunting pants are Carhartt canvas carpenter pants, and I'll layer underneith with light polar fleece or stretch fleece pants if needed. Knee high gore-tex boot gaiters keep the bottom legs dry in deep snow. Usually for shirts I prefere a basic cotton/poly blend long sleeve t-shirt in any earthy tone color and I'll layer under that with my REI brand olive-drab colored lightweight polyester zip-t base layer if needed. For cold weather headgear on rifle hunts I like a basic blaze orange fleece beanie cap coupled with my earth tone lightweight merino wool balaclava underneith.
My waterfowl hunting outfit is a bit different setup consisting of camo neoprene chest high waders, gore-tex camo wading jacket, camo fleece jacket, and earth tone colored headwear and gloves