How to separate chest area for good rotation?

[tepid smelt]

Hello guys! I am wondering how one would go about a ches rotation like the little sketch i have on the right side? body rotation is always an area I have been lacking in on my Live2D journey and I would like to push myself and rotate this body as much as possible but I'm not completely sure where to start?

She has this corset that is held up by suspenders and I have it in my head that some of that side harness area that goes under the armpit would be visible on the turn (in second pic, adjusted to show the art I currently have that is clipping down onto the chest), but I'm not sure if I should have the breasts as a single unit, or 2 units, or how to shade them, or if underfill would be possible around those suspenders

Any advice would be great!

[modest drum]

For cutting, it looks like youd want 2 seperate units for the actual breast. The fabric between them at the bottom can be a 3rd layer.
Id personally have the top of the breasts airbrush into the chest fabric at the top, so thered be easy connection there.
Add any creases or folds in the fabric (specifically in this area/ if you plan on having any stretch lines in the fabric between the breasts) on a seperate layer.
Id also reccomend seperating underbust shadows, or (if needed) shadows between the breasts.
Its a lot of seperate layers, but for movement like that, youre probably going to need the flexibility lol

Just to help visualize it ^^