Based order on reviews I ordered 3 sizes up and the fit is great!  The body of the suit is one piece of leotard-type material with boy legs. Very comfortable. My one complaint makes me hesitant to keep it - the skirt fabric is a very thin, cheap chiffon that clings. Not a normal polyester bathing suit fabric and I do not think it will be suited to being wet.  I purchased at a very cheap Lightning Deal, which makes me inclined to keep it.  It would be a deal breaker at the regular price.

If the skirt weren't an issue I would rate this 5 stars.