Congradulations on the weight loss! I struggle with weight myself and that is quite an accomplishment. Breast size almost always goes down for a woman who loses weight. Some of the fullness can be replaced by developing your pectral muscles. There are a number of exercises that can do this that are relatively easy to do and require nothing more than a bench and a set of small dumbells. Presses and chest flys will develop the muscles underneath your breasts and push them up and and outwards, giving you back some of the fullness you lost when you dropped the weight. They will not actually get larger, but they will appear that way over time. The best news is that developing your pectral area will pay off when you get older, with less back problems.

Be proud of your accomplishments and keep up the good work.