I knew what I was buying as I read the reviews. I am 127 pounds 27 inch waist and always wear a sz small in underpants or sz 5. I found these to feel too tight to be comfortable. Maybe a medium would be better. They are more like support panties than regular. As someone said more like a shaper or pantyhose. Probably will not exchange for the medium. I don’t think they are what I was looking for. They are definitely Wacoal quality
I have been wearing the B Smooth briefs for years, and are still my favorite. They work under everything, stay smoothly in place, as well as washing and wearing well.