I thought I would share a trick I have been using for a while, but only just fitted to my new Multistrada. Heated gear is great for all year riding but the controller and all the faff of cables hanging everywhere gets on my nerves, hence I have been usning this solution for a while on various bikes. It basically consists of a 20A PWM module (6 quid from ebay) and a few cables to extend the variable resistor to a location where you can access it. For this install I used a Gerbing bike power lead to provide an easily accessible socket. The variable pot is hidden out of sight but in easy access for adjustment and offers full range from 0-full bike voltage (roughly 13.8 when running). I then just connect via a curly stretch lead to the jacket. When you get off the bike just unclip and you have no trailing wires or silly heat controller. On the MS they rear power outlet is controlled via the ignition, so no need for a relay. My jacket pulls 6.6amps at full chat but that could melt a man, even in freezing conditions, so it is never really drawing more that 4amps from the 7.5amp rated accessory circuit.
Or you can geta WarmNSafe heated jacket that has a remote controller that can be mounted onto a clamp that fits onto the bars when you need it in colder conditions. I used an old bar mounted Camera mount as the platform and then Velcro to hold the controller onto the mount, essay to access and adjust. Used this on my 1260 and not needed it on the "hot" V4 yet