Hi, Chrystal - wow, that is incredible and sounds beautiful. While I am very interested in antiques and vintage fabrics, I have no idea of the actual value of your tea dress. Even if I did know, values change quickly especially in today's crazy economy.
Perhaps you could contact the historical society. Or do a search on ebay for sales of similar items. I know that museums with textile departments can give you information but not value. Most people who will give you a valid appraisal will charge you - maybe about $15.00 or so.
The trouble is that with today's economy, antiques are not commanding a lot of money (unless they are really special). Plus, people are cutting down on their stuff, so there are a lot of cool old things on the market.
I saw a few similar dresses for sale online at around $120.00.