If you are still interested in a solution, here is the one I am using: Posermatic's NBM. It's different from his NGM addon, as you have the control on the tits/areola zone (you can move them up, down, right and left), on the volume of the zones above, under, to the right and to the left of the areola.
You have many movements up, down, hanging, etc...
Look at the picture below: her left breast does not follow the dress, it's slightly concave.

This solution has an advantage on the use of magnets: as it is a set of morphs, you can copy some or all of them to the clothes.

𝒫𝒽𝓎𝓁

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(っ◔◡◔)っ

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