1.USGI Field Pants cold weather they’re like the equivalent of the M65 Field Jacket which can accommodate a liner. I’ve never used any of the military liners though, opting for good wool or poly breathable base layers
2. Wrangler ATG pants. Light, breathable work great early to mid season with base layers and double as a great base layer under my wool army pants.
3. Wool Army Pants. These are super warm and ultra quiet. There are so many brands I can’t recommend one most are from Germany or Switzerland etc. they are super durable!! I think I have 4 pairs. Have had them for years. I’ve picked them up at Cabela’s, Sportsman’s Guide, Coleman’s, Midland Surplus etc.
4. Asbell Wool Pullover Anorak. The other two items above are in the sun $40 range even less for the wool pants but the Asbell Anotak is in the $150 range but for what it does, it’s versatility as both an outer and base layer, it’s warmth and ultra quietness…. You can’t beat it imho.
5. I picked up T&K Hunting Gear’s Grid
Fleece
beany and neck gaiter this year too and those are great too! I got mine in Coyote.
6. USGI fleece polar Rec bibs. I wear them under my field pants or wool pants. They are super cheap and very effective as a layering system. I like that they don’t bulk up at my boot line nor my belt line but they cover my midrif and are under my saddle nicely.