Under Armour cold gear long sleeve mock + jacket. I have one of those fleece lined bandana dealies, too. Nice.
If it's cold, I throw a mid-layer in to the mix.
If it's warm, I ditch the jacquito in favor of hoodie. At this point, lose the bandana, too.
If it's real warm, I ditch the hoodie in favor of UA + t-shirt.
If it's 40+ degrees, I'll just wear a t-shirt.
Where I'm riding this year:
Pine Knob - 11
Mt. Holly - 2
Treetops - 2
A-Basin - 2
Mt. Bohemia - 3
Mt. Brighton - 1
Caberfae - 2
Crystal Mountain - 1