Unfortunately, you have not provided any photographs or your cup or bra size. If you are a 32 or 34 each 100 cc’s of implant corresponds to 1 cup size change. If you are a 36 or 38 each 200 cc’s of implant corresponds to 1 cup size change. From this, you can compute the volume required to achieve your desired goal. I always recommend small silicone gel implant placed retro-pectoral since they look and feel more natural, are more stable, less likely to ripple or have complications needing revision. However, since you have lost an extreme amount of weight, it is possible that you may need a simultaneous lift. There is a new technique called Breast Augmentation with Mini Ultimate Breast Lift. Using only a circumareola incision it is possible to reshape your breast tissue creating upper pole fullness, elevate them higher on the chest wall and more medial to increase your cleavage. Through the same incision, implants can be placed. Aligning the areola, breast tissue and implant over the bony prominence of the chest wall maximizes anterior projection with a minimal size implant. Best Wishes, Gary Horndeski, M.D.