I was skeptical about this being one size fits all but it fit me perfectly. The lace feels thicker & more substantial than my other lace undies that constantly rip/get holes (VS, Aerie, Gap.) It does not pinch my fat rolls but somehow stays up very well. Don't know the magic behind how this could fit all but it fit me perfectly. They're more expensive but worth the price.
I love these! I bought 10 pair because of the colors (all in the nude range even the dark ones). I didn't want a g-string but didn't want bikini lines. They are one size fits all but fit perfectly.