Hi HELLO2012 :)
There's one Hong Kong based drop shipper for wedding dresses listed at SaleHoo. Try Link hidden: Login to view
You may confirm with them directly if they allow their product photos to be used in your website (otherwise they can advise on what images you can use to resell their products). I haven't seen any reviews about them anywhere but their site has been existing since 2004. It would also help if you can make a single test purchase to confirm if the quality of their dresses satisfies your standards, and yes, do use safe payment method at all times (do not send money using Western Union).
Hope this helps. :)