I will be the first to admit that as a large busted woman finding bras that fit well is a challenge no matter where I shop.  Having been professionally fitted just last month I purchased this in a size 42DD.  It was HUGE.  The cups are incredibly large, and since I am older the volume of my breasts is not in the top part of the breast.  Even if the volume had been there, this bra still would have been too large.  It probably would fit a DDD, but not a DD.  Ribcage measurement, however, was spot on.  It just was too big in the cup measurement.  Nice bra with a nice finish, but I had to send back for a refund.  Thankfully, Amazon is great about returns and they credited my account as soon as it was received back at the warehouse.  I will try again, but not this brand.