Reddit mentions of O'Neill UV Sun Protection Womens Basic Skins Long Sleeve Crew Sun Shirt Rash Guard, Black, Medium

That depends how much skin you want to show, and what style you're going for.

For tops, there are lots of options. The sports bra type look, which shows your belly but not much chest. There's a cropped rash guard which covers even more chest but still shows the belly. Then you've got the bikini that shows the most of everything, or the tankini, which covers the belly but is low cut at the top like a bikini. There's an even longer version of tankinis now called a swim dress that I think is cute. I love this long sleeved, belly-showing rash guard too.

Now, if you don't want to show a lot of skin there's a short sleeved rash guard, or long sleeved rash guard that all cover the belly and chest completely. They have all kinds of colors of these things.

For the bottoms, there are always plain old board shorts for everyone. There are shorter ones too. There are tons of colors and lengths for those.

You could wear a bikini bottom by itself or under your board shorts. There are a zillion colors and styles of those. There are swim boxer briefs that you can wear alone or under shorts too. If you want the bikini look but are concerned about the shape of your genitals, there are plenty of bottoms in the men's clothing section that look fantastic and would be easy to match to a bikini or tankini top.