T-Strap thong sandals &something look fresh, simple, yet elegant. Don't forget a cute straw hat &sunglasses.
There are lots of stylish one pieces and cover ups out there. Google "one piece swimsuits" and you'll find a ton of great styles. Also, the retro swimsuit look is really in right now. Kind of like a Pin-up girl. And crochet cover ups are another trendy item. Check out this page (below). I like the one at the bottom that looks kind of like a sweater. But I wouldn't recommend it with a retro style swimsuit. Those are meant to be shown : ) Have a great time at your party!