I had myself professionally fitted for some nursing bras...I must say I was disappointed at the size I turned out to be. I was hoping that I became a whole size bigger than what I actually measured. Bummer. At least I am 2 sizes bigger than I was before getting pregnant.
But hey, the new brassiere's are so comfortable and fit perfectly. I highly recommend ALL women, nursing or not, to get professionally fitted for proper support and comfort.