I'm another convert to "silk underwear beneath an electric waist-coat/vest" (mine is a BMW not a Gerbing). With an insulating layer on top if needed. This combination copes with all temperatures, and as Mollydog says, allows for freedom of movement.
I'm intrigued by the bamboo comment from alexlebrit. My missus recently bought some bamboo socks and says how soft and comfy they are. Too soon to say how durable they are and I don't plan to sniff her socks. Not that there is ever anything wrong with your socks, dear, if you are reading this.
I like DAVSATO's rubber gloves suggestion. I'm increasingly coming round to thinking that you can't have truly all-round, do-everything jacket or gloves or boots. I'm now looking at getting an unlined, vented, armoured textile jacket for touring. When it's cold, I'll chuck a sweater or fleece on underneath, over my electric vest. When it rains, I'll chuck a cheap non-breathing 100% waterproof top over the top (as per leeVTR). All I need to do now then is get some extra-large rubber gloves that will fit over my leather gloves.
Even though I believe silk is the ultimate base layer, I'll try Icebreaker if I see some cheap. And maybe some Lidl/Aldi merino too.
Useful thread this, I've gleaned quite a few ideas.
Last edited by SpitfireTriple; 7 Oct 2008 at 18:58.