Finding the value of my wedding gown?

I have a Michelangelo wedding gown. There is a lot of detail on the dress. I don't know much about wedding dresses and my husband purchased it for me. The dress is gorgeous! It is covered in pearls and has a 5-6 ft train. It is an older style dress and has white bows and ons on it. Just out of curiosity, do you know how much it might be valued at?