upper: a bunch of layers, wicking first layer (patagucci), t shirt, fleece.
lower: i generally don't get that cold, so a pair of shorts, or track pants. that's it.
i've toyed with the commando thing in the ski pants, but have yet to try it!
funny thing is that my lower body rarely gets cold (i mean i don't even wear socks), but i need to wear a bunch of layers for my upper body. and i hear that the head and neck are the main radiators for most of your body heat, right?