Since I have two BMW sockets just waiting to be used, I decided to look at heated clothing at places like newenough, leatherup, even Amazon.
Pretty expensive, and not often in big sizes.
But during the course of my google search, I found out how to make my own.
For instance, I have a leather jacket made for me years ago by Just Leather in San Jose CA. It is still soft and supple, despite surviving the low side that totalled my ZX11 in an uphill 90 degree off-camber turn on a chillier-than-usual San Jose fall day.
This jacket has a zip-in quilted liner. I will turn the liner into a 2-purpose liner. It can be used just for its quilting warmth, or I can pull the cord out and plug it in for heated warmth.
I might do it for my nylon Tourmaster because I love the built-in armor. It has a zip-in liner as well, so I'll do the same thing.
Then I can use the liner from my Tourmaster with any jacket in the future.
How do you make your own? The trick is really simple. You have to find a fine gauge wire which is not brittle, so it won't break from twisting, flexing, normal throw-it-in-the-top-case-any-old-way routine. There is 32 AWG wire that meets this requirement, and it is in a plastic sheath so it is waterproof.
So you have to "sew" the 32 AWG wire into the front of the liner (chest, front of arms) with a lot of loops, and not so much in the kidney and backbone area. Just make sure that you have a continuous loop and the two ends meet at the same place.
Then attach an 18 AWG pair to those ends, and a plug on the other end of the 18 AWG pair, about 3 feet away, and you've got heated gear.
There will even been a non-resistor variable heat pot available sometime this summer, so you can hook one up to your BMW socket in series, and mount the pot beside the socket wherever you put them, and then control the heat of anything plugged into that socket.
Plus, once I can get that variable heat pot, I can use one to control my heated grips from 0-100% without a resistor.
Doing this, I'll have heated gear (jacket liner, pants liner) for a mere $50 or so. I think I'll just buy the gloves, I don't want to fool with glove liners.