Your BMI is 24, which is very good. I doubt whether a few more pounds lost would make a substantial difference in your chest.
As for compression garments, they will provide a better contour for you while you wear them. Obviously, when you remove them, you are back to where you were -- they do not change your physical structure.
If you are still concerned about your chest, then perhaps a consult with a plastic surgeon could help put your problem into clearer perspective for you.
Dr Jacobs