Martin Yes, it exists. But it is not for sale. I saw it in Latowskiβs show room when i was there to make a measuring.
That would fall into the full metal category that I mentioned in my post of the 21st, I guess. Not suitable for everyday wear.
Here is something from Latowski that is not fully integrated, but at least a matching set: Latowski matching belt and upper piece Doesn't seem to be locking though, so I'm afraid Angelina's father might not allow it - sorry π€£
Carrara designs, from Belgium, has a full body corset for sale (strangely enough for a starting price lower than some of their belts). There don't seem to be many pictures online, but you can find some on their Toys and Bondage page (Note that because of the bondage theme, this page might not be suitable for minors.)
They have an interesting alternative design for thighbands as well. I wonder if that is only for looks, or it has actual advantages over the regular bands.
Angelina a corset with an integrated belt sounds exciting
If you're mainly curious about something that can be worn in normal life, I wonder if there would be any advantage to having an integrated version, above just a suitable corset with a (waist) belt over it. It will probably be less flexible (both as in hindering movement, and not allowing the pieces to be worn separately).