How's a size 16 woman with a size 38-G bra to find a well-fitting, supportive, and modest swimsuit?

I've been searching for swimsuits by bra size and I've found plenty of results for that, but they have no way of specifying the size of the rest of the suit. I can order a 38-G swim top, but reviews on a lot of them say they're too tight, so I'm guessing they're all one size fits all, except for the bust. This wouldn't be a problem if I wanted a bikini top, as they're basically bras anyway, but I want something that will fully cover my middle, and preferably have full or almost full breast coverage.

I've settled so many times for plus size suits that fit up to DDD (and as we know, people selling them will swear left and right that DDD is the equivalent to F/G, but it ISN'T), but they just don't do it for me. I need full support, from the back, not to have a halter tied tightly behind my neck trying to hold 'em up. Especially because I actually SWIM in swimsuits. I want to do it for exercise.

Are there any similarly sized women out there on the YLF forum with a recommendation that has worked? Or at least anyone who knows where I can find a place with that kind of sizing? Ideally, I'd like a tankini top and a skirted bottom, or board shorts, which are easier to find, but a one-piece would also do. I've tried Bravissimo and Freya already, and all that pops up when I Google is Victoria's Secret, which I KNOW doesn't carry my size.

Thanks in advance!