We have a limited selection of Misses Long Torso Swimsuits which you can find by searching "long torso" or by clicking on this link:
http://www.cyberswim.com/productSea... .
However if you definitely need a D-Cup, what we suggest is either selecting two Separates items (a top and a bottom) which we have in both D and DD-Cup, or a style with adjustable straps.
In addition, some customers have had luck with ordering one size bigger to compensate for the length, but at 6', this probably would not work for you.
Our Customer Service Department is always happy to help with finding a suit to fit your needs. Feel free to contact them at service@cyberswim.com or toll-free at at (866) 315-6555.
Hope this helps.