I normally buy a 34DD with regular bras, knowing I'm just a little too big for the cups, so I went with the same size for this.  LOVED how wide and durable the band seems and the multiple hooks in the back.  Unfortunately the cups weren't big enough to hold everything so when all was scooped forward I had a decent amount of over flow.  Regardless, this worked fantastically for my bridesmaid dress and held up perfectly during the whole wedding.