Thanks all. To answer some questions - I'm not sure what size I am (will need to measure myself and use the size chart). I am a size 16 in Popsy dresses (which I live in), but Popsy is very generous sizing. I've always had an hour glass figure, but post kids also carry wait on my stomach. I had an emergency C section with my youngest and now have an apron stomach. I also have a very large bust, so definitely need support there. I've had tankinis in the past, but don't find them the most flattering as where the top joins the bottoms gives a line and draws attention to my widest part. I wear dresses that come in under the bust and then go out as I find this the most flattering.
I was hoping if I sized up on the two piece bottoms, they would meet the top. Realistically though they would probably end up riding apart. I wonder about the style of the last one on the link. Part of me thinks giving a bit more coverage on my legs would be good, another thinks it might just emphasize the size of my thighs more. Maybe I will just stick with the style I'm used to.