If you order your regular size, these leggings shape you very well, but are slightly uncomfortable in the waist, especially when you sit down or bend over.  If you order one size larger, they are extremely comfortable, but they lose some of their shaping power.

I bought 2 sizes to compare, and I ultimately ended up keeping the smaller, less comfortable pair for my purposes because I liked the way they looked on me.

The fabric is great, in my opinion---it's a true cotton legging---not a sporty gym legging.  Sometimes synthetic leggings look too much like you're off to the ski slopes in the 1980's.  They're not see-through at all, and they don't attract too much lint, which is a big plus.