People with bigger breasts?

I have a similar chest size to you (38DDD, I think it's the same). As I don't know what kind of clothes you wear, my best advice is to wear clothes that are both modest, and subtle. Try scoop or square necked blouses and shirts, empire waisted tops and dresses, and knit/crocheted tops. Try to find tops that have the neckline falling between the top of your cleavage, and and inch or two farther down. I agree, high necked tops make larger chested people look frumpy and fat.