As I wrote in this post, I think this style could work for a larger bust since the mid-bust seaming minimizes the overall appearance of the bust (as well as making things look perky!).
Here's my version, see how the shelf bust starts at mid-bust?
Here's the size 14 muslin, pre-FBA, pre-padded dress form so you can see the fit.
You can see a myriad of problems: the dress is not covering the bust, the side seams are pulled forward, and the back zipper won't close.
First, I measured the distance needed at the bust. The back gap was my indicator here, though you could go by pattern measurements compared to your own.
My mannequin needs two inches added. Obviously, we need to add this at the bust, not at the back or side seams.
These next pictures are meant to give you a visual of the changes needed. I opened up the underbust seam and then ripped out the stitches in the front princess seams.
Now the upper bust pieces need to be made bigger to match. To demo this, I cut into the pleated inset section and the bias band below it.
Besides the extra room at the princess seams, this FBA also requires extra length in the bust. See how the midbust seam is spreading open in the photo above? I decided to also add 1" of length (see changes below.)
Okay, let's translate this to the flat pattern.
1. First, I added 1/2" to the center front bodice (which is one half of the princess seam).
2. Next, I added that extra length to the top of the pattern piece, tapering down to the original center front.
3. Repeat on the bodice side front.
5. Now for the most complicated piece, the "bra." It has a ton of pleats and looks scary, but it isn't too bad to adjust. Slash and spread as you did for the stay piece.
Adding length is the tricky part. You need to fold and pin all those pleats as they'll be sewn, after taping the pattern piece to a larger clean sheet of paper.
6. The last piece to adjust is the strap, which is the bias inset below the pleats. It needs to gain 1" at each princess seam to fit the adjusted pattern pieces. Between center front and the pattern notches, slash and spread the pattern 1" on each side, adding new tissue paper behing the slash.