I've gone to my Ibex tights for this kind of riding, although they were bought for skiing. My regular fleece beanie is fine for my head and yesterday i had to wear a sleeveless base layer with a mid weight fleece lined jersey, because with my heaviest jacket (a Gore jacket I bought from Bluetree), I sweat like crazy. Today, I will wear my LS Craft base layer, though and maybe a jersey that is a little heavier. I also might wear my cycling knickers under my tights, instead of shorts.