I just received my leggings and I absolutely LOVE them. I tried them on last night and this morning they were the first thing I wanted to put on. I have not taken them off since. I could live in these!
I ordered these with the intention of wearing them under other pants when out, for extra warmth in the winter, and for wearing a base layer the rare time I go skiing or snowshoeing. I thought I might also wear them as is around the house. They fit so perfectly, are so insanely comfortable, and look so good that now I think I will wear them out and about on their own as well- particularly in the shoulder seasons.
Based on other reviews noting that the leggings are somewhat transparent, I went with black. Wearing them with black underwear right now, they are not transparent on me at all. I am 5'7" and typically wear a size 10 in pants. I considered ordering these in size large but went with medium instead, and I'm glad I did. They fit my body literally perfectly. There is not one single thing I would change about them. The length is fantastic and they fit snug enough to wear under other pants, but not so snug that they feel uncomfortable in any way. I would wear them as pajamas, to lounge in, under dresses/skirts, and out in the world as regular pants.
I have been a long-time fan of Simply Merino's long sleeve tops, which I wear all winter, but didn't think I also needed merino leggings. I stand corrected. I wish I had bought these sooner!