maybe you worded things for simplicity, but if you are actually riding in the cold wearing jeans, you might want to take a different approach.
I ride in the very late fall and early spring in temps down to 40F. I normally wear two pairs of heavy Wrangle or Lee jeans, the outside pair is 2" larger in waist size than my normal pants. I could also wear regular thermal underpants, but its easier to take off an outer pair of extra jeans at work, than to go in the mens room and take off thermal underwear.
I wear a thermal long sleeve T shirt, a heavy cotton shirt, and my 3 layer Tourmaster MC jacket. I made a pull over for my neck and chin, and with a full face helmet and wool socks, the only part of me that normally gets cold is my hands, more specifically my fingers. Riding my normal 30 minute commute Im comfortable. Better still if I have my Memphis Shades "Fats" windshield on the bike. I have a couple pairs of gloves that are tolerable - keeping my hands behind the windshield makes the biggest difference.
If you are going to try to keep part of your body warm with heated clothing, you have to keep your whole body warm then. Your metabolism averages things out, if you have heated pants and a vest, your arms and hands and feet will get cold.
By itself your body generates about 500W of heat just standing or sitting. Keeping that heat trapped is usually all you need.
A different approach would be to get leather pants and a wind tight leather jacket. Even in the open wind leather does not let the cold air strip away the layer of warm and moist air from your skin. I think that riding when its cold out, within reason, is a good form of exercise for your system, keeping yourself warm out in the cold is a bit more robust than riding in a car with the heater set to "toast".
Last edited by KCW; 02-05-2018 at 12:22 PM.