Allison G.wrote a review of Patagonia Capilene Lightweight Bottom - Women's on February 7, 2019
Fit: True to size
I just received these so I haven't put them through the wringer but I wanted to write a review on fit and material. I think they run true to size when you compare them to other leggings or yoga pants you may already have. I am of average height and curvy/athletic build but no butt and the small fits perfect. The waistband felt nice and wide and sat at a nice place - not too low-rise but not high-waisted either.
The model in the photo shows some bagginess/looseness around the ankles but I found that was not the case with me. They fit smoothly like regular leggings.
They are not totally see through but I would steer clear of brightly colored or patterned panties underneath. Something seamless in a dark or nude color would avoid VPL.
I have never purchased a base layer before as I live in a warm climate, but these seem lightweight and breatheable. I will be using them in Alaska this spring and summer as a layer for underneath pants, underneath drysuits, and as a pajama/comfy bottom.