--a couple of things you can try:  Increase the size of the bra maybe 10 percent.
                                                          reduce the breast size maybe 10 percent
                                                          reduce the size of the bikini bottom or increase the model's hip
                                                          width.

When you don't have the standard (default) size, you can try the above to get it to fit--if the proportions aren't too far off, it will work.  Jan