Ordered this for my 8 year old dtr...4'5" and 67 lbs. The medium fit perfect. It looks really good, just needs fluffed up a bit from being folded in the plastic container. It is thin material & my dtr stated it was itchy, so a pair of leggings & a long-sleeved shirt will work fine underneath, still fitting well. Length is perfect, not too long or too short, hits above the ankles a bit but looks just right still enabling her to maneuver school party & trick/treating without issues.
Overall, nice costume.