I want 34B to a D cup, surgeon recommended 375 cc. Thoughts on implant size? Surgery scheduled for 11/14/2014. (photos)

Size is a very personal but crucial decision when considering breast augmentation. This decision should be made jointly with your board certified plastic surgeon as there are other considerations outside of patient goals/desires (chest anatomy/width, skin envelope, pocket dimensions etc...). There are a number of ways to go about making these decisions. Typically 150-250cc of implant volume is believed to correlate with a single cup size increase. However, it is important to realize that cup size varies by designer and size. Often times sizers or 3D imaging can be employed to more clearly define a patients goals. These tools can be helpful in bringing a patient's desires into line with the realities of augmentation. Communication is key.Based on your photos, an implant in the range of a 325-350cc would be reasonable and is likely to achieve a "D" cup. However, it is important to discuss all of your concerns pre-operatively with your board certified plastic surgeon.

Thank you for the question and pictures. Given your concerns and questions, and the importance of clear communication to the success of breast augmentation surgery, I would suggest that you schedule additional time with your plastic surgeon,  prior to the day of surgery. This will be time well invested;  much better than having regrets afterwards…  
 Unfortunately, online consultants will not be able to provide you with specific enough advice to be truly helpful.
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant size/profile selection) is:
1. Concentrate on choosing your plastic surgeon carefully.  Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you are looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals  with your plastic surgeon. This communication will be critical in determining  breast implant size/type/profile will most likely help achieve your goals. 
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as  “natural” or "D cup" etc means different things to different people and therefore prove unhelpful.
 Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup  size may also be inaccurate.  The use of computer imaging may be very helpful during the communication process.
3.  Once you feel you have communicated your goals clearly,  allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals.  Again, in my practice, this decision is usually made during surgery ( after the use of temporary intraoperative sizers).
I hope this, and the attached link (dedicated to breast augmentation surgery concerns), helps.  Best wishes.