After reading many of the reviews, I decided to size up.  I am 58 in height, fluctuate in the range of 130~135 in weight, measure 26 around the waist, and normally wear a medium. I ordered an XL.

The waist is too big (the skirt is kind of heavy too, which is making the skirt sit lower yet on my hips), and the length, too short (comes a little above the bone on the inside of my ankles).  Its a pretty skirt, but the sizing is definitely off.