First off, lose the jeans. For a first layer, find some polyester briefs; cotton, particularly against the skin, will absorb moisture from the skin and function as as an excellent conductor, very effectively drawing heat directly away from the body. For a second layer, I favor knit polyester or stretch fleece; such garments are available in a variety of weights. Don't worry about the brand name, there's nothing magical about UnderArmor or any other proprietary brand, the important characteristic is that it absorb little or no moisture, which is true of all polyester.
You'll hear people talking about "polypro"; to the best of my knowledge, no one is still making polypropylene underwear, the material had great wicking properties and absorbed virtually no moisture, but it tended to absorb and bond with oils from the skin and, as the oils became stale, would begin to stink (climbers used to call it "polystinkylene") and, after repeated washing, tended to become rough and scratchy.
In really cold conditions another, outer, layer might be necessary and polyester fleece pants are available in several weights. Good places to look for such garments include ski shops and, of course, Cabela's. For the upper part of the body, the same principles apply. Polyester tee shirts or long-sleeve crew-necks make a good base layer; I like a zip turtleneck because of its greater ventilation flexibility (again, avoid cotton). Finish it off with a waterproof and windproof layer (breathable waders and a breathable rain jacket work nicely).
Feet are an area of particular concern: The best material for socks is, without question, wool. The strength and resiliency of the wool fiber retains more loft, particularly under the foot, and provides better insulation than any synthetic material. Again, don't worry about the brand, almost any 80/20 wool/nylon blend will do the job; overpriced, over-advertised brands are just that. Bootfoot waders, particularly those with insulation, will always be warmer than stockingfoots with wading boots. Circulation, especially in the feet is the key to warmth, always make sure you have "wiggle-room" for your toes.
Hats seem to be a very personal choice, something to cover the ears is nice and, in very cold weather, even a balaclava might be useful, the rain jacket hood should provide wind protection. I hope this is some help to you.
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