First mod. Made the Cait's Corset look like corset by editing its mesh in bodyslider (so it's for CBBE).
Now, it's tight around the waist and also contains cleavage.

[WARNING} This is not compatible with bodyslider, even though I made it using bodyslider. Because of the idea of making cleavage. I couldn't figure out how to make a body's breast turn to cleavage only when player wears the corset. So in the end I use this outfit with reference. If you're using slim or curvy or something inbetween, this mesh is okay for you. If the body you use is something extreme, then it would be weird.

[WARNING2] I don't actually have the time fix the bugs and all. I just uploaded this to share the idea (which is making corset look like a corset.) So, I'm just hoping someone who has experience with these tools for making mods on fallout, takes the idea and uses it in a proper way.