Will a Breast Lift Drastically Change my Cup Size?

Breast lift surgery is intended to affect the positioning and firmness of the breasts, not their size. Although the removal of excess skin that occurs during a breast lift can slightly reduce breast volume, this difference is typically minimal. For patients who wish to either increase or decrease the size of their breasts in addition to their breast lift, the procedure can be combined with either breast augmentation or breast reduction. When performed by an experienced, board-certified plastic surgeon, combining cosmetic breast procedures can help reduce recovery time and costs, and help patients achieve more comprehensive aesthetic results.

One of the most difficult predictions we make in breast surgery is post operative bra sizes. Unfortunately there is no standard sizing that bra manufacturers adhere to. 

Breast lifts remove skin, tighten the breast envelope but do not remove large amounts of tissue.  Bras may fit differently after surgery, bu not to the extent that one would expect a change from a DD to a B cup with the same bra manufacturer.

Without photos to review, it is difficult to make an accurate prediction. I recommend looking into a second opinion to put your concerns to rest.