Layers.

I tend to wear a Mountain Hardwear T-shirt (mostly poly something) over or under a Patagonia 3 long sleeved shirt made of Capilene. I think that Capilene is the bomb, I have worn the same shirt for 5 days and 79 miles with no complaints from fellow travelers - no worse than them and downright petunia smelling compared to a few. Really though, Patagonia wears well and is comfortable and really doesn't make me smell after days on end. When it gets wet you stay reasonably warm until it dries.
Now is the time to search out Patagonia discounts on this stuff (and other base layers and winterish clothing) - Mountain Gear in Spokane mountaingear.com has a sale going on.

No affiliation etc, just a happy customer.