XPOST FROM BHB - HELP!!!

I am desperately looking for BM dresses in the exact color in the pic below... It looks like a taffeta material to me.....Can anyone please identify this color and designer or a very similar one??

Thanks so much!

xoxo
Maria

The pic is too big... Here's the link:

http://solarisphoto.files.wordpress.com/2009/03/group-wedding-photograph.jpg