I know a woman who wanted a unique wedding gown and so she went to night school and had all the help she needed designing and getting it put together.

As far as fabric.....ivory colored brocade sounds right up the alley of a fabric store that is high end and caters to designers, bridal and such. Some theatre companies hold auctions of their old costumes whereas you could maybe find the style you want and take it apart for the pattern.

Lizz I hope your an experienced seamtress for if not you are taking on a huge endevour.....one that will end up with you pulling your hair out.....try a local design school/college. Surely there is a local person who is a wonderful seamstress who can take your idea and turn it into reality. There you may find someone just waiting for you to create something with tastes such as yours.

Sometimes trying to be cost effective is not possible with such an undertaking as yours. Lots of luck.