I need to find a plus size swimsuit for a large cup size

    Exelnt Designs goal is to take the frustration out of buying a swimsuit. They  have been making swimsuits for 26 years. Fitting women that have a hard time finding a swimsuit that fits properly is what They do best! All swimsuit styles can be ordered in all fabric colors. Look over the styles that are available, and if you are not sure what to order, call them and they will be glad to help you decide what's best for your body shape. Most suits come by the bra cup size. Some suits are designed for D and DD cups and others for F, G, and H cups. Standard cups will fit A, B, and C cups. Most standard cups will also have a hidden pocket in the bra lining so you can add a lift or shaper to enhance the bust size. They can custom fit a swimsuit for you.
   
They manufacture their own swimwear and have thousands in stock ready to ship. If you are not sure what size to buy, call during these hours and their trained staff can help you.
support@exelnt.com I think this is the site for you to find a perfect suit or have one customize to fit your needs! ; )
    
One Piece with Accents     $142.50
Style #1501-R
V-neck one piece with cinched waist and rectangle embellishments. Designed with an underwire bra for extra support and fits D and DD cups, fully lined.
Sizes 10 - 26.

Halter Underwire Top     $59.50
Style #602
Halter underwire with a push up look same style as 906 but designed for rib cages 36" and 38". Light fiber with pockets for optional push up pads. Adjustable neck & back strap.
Sizes A - G.
Skirted Bottom with Panty     $68.50
Style #7056
Skirt bottom with side slits and attached panty.
Sizes 6 – 28.
 

Finding the right swimsuit is always hard especially finding them in larger cup sizes. You might want to try something with a bulit in bras or at least a good inner linning. Try http://www.biggerbras.com they have some nice suits you may like and that are very supportive and slim fitting. Here are some examples: