In spite of what Ms. Birnbach wrote in her latest book, I'm not sure how much of a staple polar fleece is in a classic wardrobe. However, if one must own a fleece, there is only one acceptable choice: the Patagonia Synchilla Snap-T. I know that Paul over at Dreams of Perfection will agree with me. Additionally, the primary color choice is dark green with the purple lining.
I'm not sure what there isn't to love here. It's warm. It's a classic. It has a collar. It has a front pocket (frocket?), which snaps, nonetheless. The purple and garish blue lining on the inside are just ugly enough to make it not cool, but not ugly enough to make it unwearable. It even looks good with a tie.
Sure, you can buy one new, but they don't call it "Patagucci" for nothing, as a new one will set you back around $100. Instead, head over to Ebay. I'm pretty sure they've been making these things since the 80s, and they can be picked up pretty cheaply (and in the dark green, which, for some stupid reason, is no longer being made).