Got any advice on winter mtb clothes?

[Natasha]

I pretty much wear the same mountain biking as road biking. My legs are usually the cold spot. I wear a pair of Sporthill windproof pants with long underwear underneath. However if it's much below freezing I wear my Mountain Hardwear tech windstopper pants. They are great at keeping me warm, but are kind of constrictive around the knees while pedaling. No need for a chamois.
On top I layer as many base and mid layers as needed for the conditions and use a windstopper shell. A windstopper skull cap works well under my helmet. I usually carry some chemical hand warmers to put into my gloves as needed.
Most of my winter biking clothing is not bike specific, just whatever is needed to keep warm.

[nuthatch]

Thanks, gals. It looks like sticking with tights is the way to go then, with an outer wind/water pant if it's really slushy. I've got Performance Triflex tights, which I really like for commuting and road. I was just worried about ripping them up out on the trails.

[DirtDiva]

You can also get waterproof baggy shorts, which I lust after majorly as a dry bum is a good thing, but full overtrou would be far too hot on climbs. If you suffer from cold toes no matter what, you can get proper winter boots for mountain biking that I have heard many swear by.