I have the same issue, and I look for any swimsuit with tummy-control swimwear (warning they are TIGHT and hard to get into, but once your in they do the job). I worked with a stylist who told me tankinis are not my friend, and to look for swimsuits with crisscross or diagonal ruching.

J Crew has some great ones with ruching, and lots of colors: J.Crew Swim Suits