Will Breast Implants Ruin a Tattoo on Upper Rib Cage?

IT is possible will "pull" the tattoo onto the breast. This is called skin creep. IF this is a major concern, I would defer the tattoo unitl you get the breast implants.

You should definitely wait.  You want to know exactly how you will look before you get a ta too.  The breast augmentation will most likely cause the skin to stretch and can in turn make your tattoo look distorted.  It is primarily your decision but I think if you are going to make such an investment in your body, you will want the best results possible. Good Luck!