595 Silicone Breast Implants?

Without pictures or an exam, I cannot comment on whether those are the right size implants.  I would advise you to try them on in your surgeon's office before surgery to make sure you like that much extra volume. Good luck.

One way to size the implants is to try them in the office with a large sports bra.  If you like the look of the implants, this may allay your fears as to the final result.  I do agree however with other posts suggesting that if taking up excess skin is the concern, a mastopexy would be a better choice with a smaller implant size. 

Hard to make any comments without; photos, examination, measurements, etc;.  There are many variables when choosing a size.  Please make sure that you and your board certified plastic surgeon are on the same page.  It may help to bring in photos of what you would like to come close to.  Remember to be realistic in your expectations.

In order to make an accurate size recommendation, I would need to assess your chest wall and breast mound measurements and characteristics.  Unfortunately, there is not a general rule of thumb or objective criteria to implant selection.
Your plastic surgeon will perform several measurements of your chest wall and breast anatomy and determine a range of implants that both fit your chest wall and reach your desired goals.
The next step is to try on this range of implants in the office with your doctor.   The key to this success is showing your surgeon the body proportion you desire with a bra sizer and allowing your surgeon to guide you to the right implant.   It will be much easier to communicate in implant cc's than cup size when determining the appropriate implant for you.
I wish you a safe recovery and fantastic result.
Dr. Gill

That is a large implant to have for initial augmentation. Certainly no one can tell you if that is best for you without photos and more information.  You can expect to be at least a DD or larger.  I would recommend you get one or 2 other opinions, and find someone who has sizers to try on.  I use those regularly and it helps tremendously for both the patient and me as the operating surgeon.