I drew some quick sketches of bathing suit examples/ideas. The one on the left is nice and classic, clean, elegant - simple. A design doesn't have to be crazy with ruffles and details to be beautiful. The top one is more cute - it would be ADORABLE on a Lalafel! And finally the bottom, something sporty. I thought of Speedo, and Cactuar are traditionally very fast, so a simple Cactuar logo fits right in. A Chocobo could also work.