I have always wanted mermaid leggings and I finally found a beautiful pair. I followed the sizing chart when I ordered and they fit great. I have tried many leggings and they can be somewhat see through. These are not see through and the pattern does not distort in any way. They look as nice on a hanger and they do on me.
https://www.amazon.com/Womens-Fish-Scale-Leggings-Bodycon-Trousers/dp/B01LW41GC2