Post-Nursing Mothers

I'm down 50lbs since I had my son about 14 months ago. It seems like the only thing on my body that hasn't gotten smaller is my breasts. I went from a 38DD to a 36DD. I plan to continue nursing him until age 2. What have your experiences been with breast size after discontinuing breastfeeding? I am hoping to get down to at least a C-cup.