I bought this for an upcoming trip to Florida where we will be doing several days of water parks. Based on the reviews (running big,) I was unsure what size to get. I have recently lost about 35lbs, and depending on sizing...can range between 14-18, but most commonly a 16. I actually bought both (14-16 & 18-20) since they had been out of stock in both sizes and only had limited stock when they got them in. I was planning on trying both and returning one. Turns out they both fit, although for this trip I will be wearing the larger of the two. I plan on wearing as a dress over my suit to and from parks. I like it so much, that I'm actually keeping the smaller one for next year (hoping to continue losing a few lbs.) In my opinion, a perfect cover up. Flattering cut, long enough to wear out, comes down to my knees, not see through, and has sleeves...which is hard to find!