Bought these in a store. I was looking for no-show underwear and can confirm these do not show under leggings! Unfortunately I found that they didn't stay in place and constantly got stuck between my butt cheeks. I bought my normal clothing size and they seemed to fit correctly so I don't think it was just a sizing issue. I think I need something with more coverage to stay in place properly.
I also tried the full brief version and had the same problem with them although I liked the higher waist better.