As a jewelery designer, I try to support artists. Etsy is a great site to shop for handmade...well, handmade everything. There are some great clothing designers on etsy, including Carol Hannah, a finalist on the last season of Project Runway. She just launched an etsy site for her bridal collection.
Here are some pieces from her collection:
I also found an eco-friendly bridal designer, Morgan Boszilkov. She makes dresses to order, based on your measurements, using sustainable materials. The dress pictured below, "Charlotte," is made of a hemp/silk blend.
I found another designer on Etsy at Fairy Tale Weddings. They will work with you to design your dream gown. I really love the romantic feel of her dresses. Here are a few of my favorites: