You want your inner layer to be wicking -- no cotton. Next layer should be insulating and warm, and the top layer should be water proof but breathable. You will need clothes for hiking during the day, lounging in the evening, and for sleeping. Layers are important as temperatures vary greatly.
Long underwear, Fleece jacket or wool sweater, Fleece pants
Be sure to break in your shoes before the hike!
Large duffel bag or backpack with rain cover, for Support crews to carry Day pack and rain cover, for you to carry.