The leggings are cute but hard to work out in, the elastic waist is a bit loose. Definitely size down if possible. I already took the smallest size available so could not size down but they slip a bit and are not comfortable for exercised only lounging.Love the feel and comfort. HOWEVER, and this is a big however - - there is literally no waist support so the yoga pants slip down. No way can you exercise in them. I wear them as night pants home. Have to pull up waist all the time. It doesn’t roll, the pants slip down.I love these, but they don't fit around my waist. They are constantly falling off my hips.This is just my try, I have Aerie’s crossover legging, they are exactly the same, it’s really comfortable, I love the v-cut design in front, very nice, it makes my waist perfect. My height is 5.2 and weight is 110lb and I got S, actually I prefer lil bit tight-fitting, size XS probably more suitable to me but unfortunately they don’t have smaller size. Anyway the color black is perfect. You don't need to worry about the underwear being seen through, feel free at the gym. Barely have such a nice experience on Amazon.