Could you get a second opinion on the tailoring if you really like it?
It's years ago but I got a dress altered for my best friend's wedding (patterned not as much as yours).
Dress maker split in two. Took lenght off the bottom of the torso and then took the shirt part up from the top and narrow it along the side.
I ended up with a two piece but it didn't look like seperate parts when wearing it.
It did cost a small fortune though.
Not a seamstress so it might be a really bad suggestion but just posting in case it's worth exploring.