I'm not very familiar with women's clothing or fashion, but I have a good friend running and online clothing boutique for women. She's a fashion addict, also running a fashion blog offering tips for trendy women. You may want to check her boutique (http://jezzabelle.com) or her blog (http://jezzabelle.com/blog/) and see if she doesn't have that dress on sale too, or you can try to contact her and ask her directly. I'm pretty sure that with all her connections in the fashion/clothing world she can help you find this dress. Anyway, good luck finding you desired dress :)

It might be a foreign design. Looks like the street in the photo is cobblestone.