After doing a little research, I've now discovered that this masterpiece is by Rafael Lopez for Atelier Mayer. Sigh - it's just a little piece of Heaven!
And look - it's available here: http://www.atelier-mayer.com/product/rafael-lopez-lace-and-feather-dress-cape
It's a steal at only £ 4200.00 - and includes a cape as well (although I can't imagine wearing the two pieces together, seems overkill to me).
