If you are interested in adding to your layering possibilities, I can highly recommend the merino wool sweaters available from Sierra Trading Post. At $20 you can't go wrong and the cold weather performance is great.
PoloMock TV NeckThere are also wool dress pants that I use in the summer which out perform cotton, microfiber and nylon. I find wool dress pants from Eddie Bauer outlet, Lands End clearance sale and those like these. Pick up a few pair to try for your summer garb.
Plain FrontWool Blend Plain FrontPleated Front