Dance Sweat Pant II
Dance Sweat Pant
These two pairs are essentially, to me at least, exactly the same. The Dance Sweat Pant fits me a little better then the Dance Sweat Pant II does though. Compared to other pairs of Lulus that I own, these are a lot thicker, and it's great for the winter weather. I picked these babies up for $49 apiece (originally $74), which, for Lululemon at least is a really good deal.
I highly recommend Lululemon if you're looking for comfortable yoga pants, they are a little pricey, but they're of superior quality and last you a very long time.