I was a little skeptical when I first ordered this since its sizing options are either P/S or M/L.  I'm 5'9", 155lbs and often find that these little dresses like to ride up and show my butt. This is not the case.  The M/L is perfect! It's made out of super soft, stretchy, material, but it's thin and breathable enough that I don't see any problems wearing this to the club.  I can literally pull this down to my knees, or let it bunch up (which I do, obviously to hide love handles).  Keep in mind, the opening on the back is smaller than is shown on the model, probably because she is 5'10" wearing a small, and has it pulled all the way down.  The color is a little darker than I anticipated, but I love it anyway.  I recommend this dress to anyone looking for a comfy, sexy dress for a night out!