Slightly larger than expected. Im 52 and weigh 115. I order the size 1 and they are just a tad too big around the waste. I don't know that they do anything magical for my butt, however they don't flatten it like some jeans do. Theyre definitely designed for curves. They seam to be good quality, but I haven't had them long enough to really know how theyll hold up.
Being short, I thought I might be able to unroll them and wear them as full length jeans, however they do not have a real hem. I cant really complain about that, since thats not the intended use, but just a heads up if you're short and have the same idea.