I bought a medium and while it did fit, it was a tighter fit than expected. I have a long torso and the crotch was a little tight, but still wearable. I would have liked it a tad longer (and I have very short legs!) but it still looks pretty cute and I like the fabric, it feels durable and soft. I believe they have made a longer version, so look for that.
Rated -2 on a scale of minus 2 to 2, where minus 2 is Runs small, 0 is True to size and 2 is Runs big