I haven't used one in an aircraft, but I've been riding with electrically heated vests and jacket liners for 30+ years. They make it possible for me to ride year-round. I don't do that as much anymore, but for almost 20 years I was committed rain or shine. I would think that in an aircraft a temperature controller would be important, since you don't have the icy blast on you as on a bike.
My current jacket liner is from Firstgear, but all of them are probably good. I use it with an optional wired controller from the same manufacturer. Probably a safer choice than a wireless gadget if you are concerned about interference. I think most manufacturers of motorcycle heated gear have a wired option.
While you could run it on a battery, I don't see an issue with plugging it into the aircraft power. It's a simple resistive load. If your charging system has the capacity, it's no worse than leaving a landing light on.