Glad it's working out for you. I tend to agree with member Old Iron maker. If you're sitting still, and the heated clothing is not too hot as to make you sweat, then great. But once you start working and producing your own heat, you need to open up a bit to prevent perspiration.
Years ago, friends of mine had those motorcycle jackets that plugged into the bike. They seemed to be good, but again, your just sitting there not creating your own heat.
When I used to deer hunt we would to trek into the woods about 5 miles to our favorite hunting spot. My brother-in-law always wanted to hustle in there. I however would unzip my jacket and take my time. With his method, you would be soaked when you got to your "spot" and would have to sit all day freezing. It was literally all day from sun up to sun down, sitting in one spot. Not really that fun if you start out with wet undergarments.
I was taught early on to wear silk socks under my heavy socks. Silk will not absorb moisture, so your feet will stay dry. It's all about keeping your skin dry.
All these modern man made high tech materials sold now are great. Polypropylene, Under Armour, etc...