I would say no jeans, no flannel, no carharts. Carharts suck period for mobility. Cotton longjohns will kill you. spend the money on Smart wool or silk long johns if you got money or poly propelene if you can abide the smell. Double or triple up on the long underwear when it gets colder. I got a pair of poly pro running pants that are kind of like real thick, long johns but have a lot of mobility. NO COTTON-NO COTTON -NO COTTON. It always makes me mad that they sell all that cotton "outdoor" hunting gear. The stuff is hypothermia waiting to happen. Good socks and fill your pockets with those hand warmer things. I dont agree with the plastic over socks, your feet will turn into ice cubes if they cant breathe. Own good boots and don't let the snow in. I believe in turtle necks and keeping the blood in your neck warm. Vests are also good to maintain mobility but keep the core warm. make sure your wrists are covered and your head is covered. If the blood on your wrists gets cold it takes the cold back into your core. Knee socks are good too. Keep everything tucked in. If you got enough long underwear on, than arborwears are fine with maybe a shell. I have been wearing my SIPs chainsaw pants in the winter. (i dont in the summer because they chafe my legs without longjohns). I also notice my groundguys have their chainsaw chaps on all winter regardless if they use the chainsaw. Chaps are great against the snow.