Fine Line Underwire One-Piece Swimsuit

I’ve been looking for a one piece that was flattering for my size/age yet still not appearing as an older styled swimsuit. I love the push-up and the belt look, yet the belt isn’t adjustable, it’s just there as a design. The back is what I feel makes it that “old fashioned” look and I’m not fond of it but as super flat chested and this works for the front of me lol. The back of me will have to look old lady-ish. I’m approx 140ish lbs and I bought size 6, fits like a glove.