Sorry for digging up the dead.....
Not being a pillion, I don't have the comfort of the warmth or protection from the rider.
So being a rider I have found ICEBREAKER fabulous gear for under my riding gear for the cooler times.
http://www.natureshop.com/pages/massive-icebreaker-clearance?gclid=CjwKEAjwwZmsBRDOh7C6rKO8zkcSJABCusnbIViT-O_v_uuxNKvwM7ndTr034bTnisldbY5CCza3zBoC8ZLw_wcBI usually combine the base layer or layers with a Merino mid layer (I have Kathmandu & Aldi) both of which are great and all the apparel washing well (just don't stick it in the dryer).
The Merino especially the IceBreaker you can wear for 4 days and I'll tell you it doesn't pong....seriously!
On the long hauls, where I am away for days/weeks the less you have to carry the better and it also cuts down on the washing
I hear some of you saying ooooooooooooooooo and fair enough.
Another good buy are the Winter SKI socks from Aldi. They have slightly padded areas on the shins and instep and have reinforced toes and heels. They are warm and wash & wear really well.
Anyway, my 2 cents seeing as we are in the chilly season of the year.