For a more relaxed and updated look, consider a tankini or skirtini.
If you prefer the appearance of a skirt, a skirtini style is ideal.
Woman Within sells the Delta Burke skirtini and swimdress.
For instance, if you were looking for a tankini and found a skirtini at half the price, then in order to save a few dollars, you may want to buy the latter.
Shirred Skirtini Bottom: This swim skirt (pictured right) is the perfect bottom to a tank style top.