These leggings far surpassed my expectations! They fit very true to size, are extremely soft, and very flattering. The waistline hits right at my belly button, which helps hold me in, despite the leggings being extremely lightweight. For reference, I am 56, and generally wear a size 12 bottom (due to c-section pouch, which is finally shrinking!). I ordered the regular OS and they are perfect; no stretching or panty lines.