What Cup Size Will 400/425cc Make Me If I'm A 34B Now?

Thank you for the question.

As you mentioned,  cup sizes always difficult to determine depending on the person and the specific bra manufacturer.

Likewise,  there is no direct correlation between  the size of breast implants  and the resulting cup size.

In planning your breast augmentation procedure it will be very important to communicate your size goals with your surgeon.  in my practice I find the use of goal pictures to be very helpful.  in your case you could use your own before breast-feeding pictures as the goal. I have found that the use of words such as “natural” or “C cup” or "fake looking" or "top heavy" means different things to different people and therefore prove unhelpful.
 

Also, as you know, cup size varies depending on who makes the bra; therefore, discussing desired cup  size may also be inaccurate.


I use  intraoperative sizers and place the patient in the upright position to evaluate breast size. Use of these sizers also allow me to select the breast implant profile (low, moderate, moderate plus, high-profile) that would most likely achieve the patient's goals. The patient's goal pictures are hanging on the wall, and allow for direct comparison.
I have found that this system is very helpful in improving the chances of achieving the patient's goals as consistently as possible. 
By the way, the most common regret after this operation, is “I wish I was bigger”.

I hope this helps.

Hello! Thank you for your question. In
general, implant size does not
correlate with bra cup size. The cup size itself will vary from
manufacturer to manufacturer as well as who is doing the actual
measurements. Thus, cup size is never a reliable indicator for your
breast size. I typically encourage my patients not to communicate her
desires in cup size but more on the actual look and appearance. Given
your desires, a breast augmentation, with an implant or fat grafting,
would be an ideal procedure that would meet your expectations. Breast
augmentation is now the most popular procedure performed in plastic
surgery today. One tolerated very well by women with minimal downtime
and high patient satisfaction. Good
communication between you and your surgeon of your expectations is
warranted - choosing your surgeon wisely is the first step. Discussion

of your wishes and having an honest and open dialog of your procedure is
mandatory (e.g, implant type, incision, placement, etc). Your height,
weight, breast width, and body habitus will make a difference for which
implant style/projection to choose. Implant
profile will also make a difference on the projection, which will
influence overall breast/cup size. I have found

that photographs brought by the patient is helpful to get a
visualization of the appearance you wish for in terms of size, shape,
fullness, etc. In addition, your surgeon's pre and postoperative
photographs should demonstrate a realistic goal for you of results.
Sizers are helpful during an in-office consultation. Once this has
been accomplished, allow your surgeon to utilize his/her best medical
judgment during the procedure to finesse the best possible result for
you after preoperative biodimensional planning and fitting the right
implant for your breast width. This is the most important determinant
for the sizing of implants, which will provide the optimal result and
most aesthetically-pleasing result for you.Consult with a
board-certified plastic surgeon well-versed in breast procedures who
will examine and discuss with you the various options and factors to
consider and help you decide which one will be the right one for you.
Hope me that this helps! Best wishes for a wonderful result!

Predicting cup size after breast augmentation is tricky because bra manufacturers use different standards. It is usually best not to be too concerned about what cup size you will be, as a 36C will be a different cup size than a 38C, even though both are "C cups".  My patients view my before-after photos and can usually find one of my patients who has a similar body size and build. They can then get an idea of what different size implants can look like, and will have a preference we can work with.  My patients also try on sizers so that they can see what  the various size implants (400 cc vs 350 cc or 300 cc, etc) would look like on their own body.  Since everyone has their own taste in body proportion, I feel this is a good step in helping my patients select the size implants which look and feel best for them.