I got the low-rise, which the seller said runs small. Ended up with a size 6 (I am usually a 5 in juniors and a 27 in misses denim like Hudson), which fit perfectly on me. They are just like wearing fleece lined tights under regular skinnies except without the bulk - I wore them for almost a week straight when it was seriously raining here, and I loved them!
The back rise is low, though. I think for you I'd suggest the regular rise, which they say runs TTS.