Since reviewers stated to size down, I did just that and ordered a size S, I could not even get it up over my hips! I am usually a M, so I will exchange for the M. I am 5'4" about 130 lbs. I guess I just have a bigger butt! It seems like it is more true to size so I'd say go with your normal size and you'll be good to go.
I do love the waist band and ruched sides that you can adjust up or down, and love the material. It's a cute skirt!