Boobit, help me and my DDD's find a wedding-appropriate corset.

Hi guys! First post. I love that this subreddit exists!!! I'm a 32DDD, and this summer i'm going to be the maid of honor in my ex-girlfriend's wedding. From that detail alone, it's probably apparent that this isn't the most conventional wedding: they're both already married (to each other), so the ceremony is going to be small and casual. Since her husband is German, we were even going to wear dirndls instead of bridesmaids dresses, and then the bride got really gung-ho about all of us picking our own dresses, that she didn't want us to match...anyway, after a couple months of this, her slimmest bridesmaid came into the group chat and announced that we were going to be wearing those god-awful infinity dresses because they were, and I quote, "flattering to all body types!"

Which like, as a busty girl? NOOOOO. Of the "infinite" number of styles, they are all either plunging, backless or at the very least hard to wear a bra with. I looked around; stick-on bras don't appear to exist in my size. I hate bandeaus; they give me major boob-shelf. I've finally come to the conclusion that if I'm going to be required to have my undergarments showing, I might as well go all-out and wear some sort of a corset, or at least a sparkly corset-looking top, under the dress. I'm the maid of honor, so I'm supposed to look a little different from the other girls anyway, and at least this way I won't feel like I'm stuck in big-boob purgatory, tugging at my top all night.

So, a question: is there such a thing as a corset that is both classy enough to wear semi-visibly at a (casual, alt-ish) wedding...that also comes in a 32DDD? Your help is totally appreciated, not in the least because it's keeping me from showing up to the big day looking like this.