It's not that a silk tie would look out of place under your sweater or paired with a tweed vest or corduroy blazer. It's that a wooly tie in a winter-weight fabric (think woven cashmere, tweed and flannel) just looks better. One part natty Ivy League professor and one part dapper cad about town, knot one with a crisp white oxford and call it a day. The textured ties may not add much warmth, but they feel as good as they look. And if you're thinking that seasonal ties are superfluous, just ask those screaming pundits on TV if a man's choice in neckwear matters.
A wooly accessory with a lot more warmth? The classic marled Wigwam socks. $11 a pair, by Wigwam.