I bought these in anticipation of moving to the Alps, which are much colder than the temperate PNW! Although I haven't tested them in sub-zero weather yet, I can already tell they will be perfect for skiing, snowshoeing, and layering under my looser jeans, or wearing with dresses or skirts.
I was borderline between a small and medium since my weight is all in my hips, thighs, and booty, and is mostly muscular. I definitely could have fit into the smalls, but I'm glad I went with the medium because they have just the right amount of give. The smalls would have been skin-tight, which I find doesn't keep me quite as warm. The thick waistband is amazing. I really like the aubergine color (it really is spot on - maybe just a tad lighter and redder than an eggplant). I could see how someone without a curvy butt and muscular thighs might find extra room in this style, but it's perfect for me! Also, there is some room for longer legs (maybe an inch or two), in case there are any taller ladies checking these out.