I bought a pair of Sugoi yoga pants for a friend who is tall, and I was able to actually buy the correct size (rather than a size larger) because they were perfect in length for her. Would have been too long on my short little legs, but they work great for her.

I think they might be these, but a previous year's pair:

http://sugoi.com/item/76120/SUG41120F

Those say 32" inseam. Might still not be long enough depending on how tall you are.