User blog comment:Zathronas/Analysis by an author: Volume 2 episode 3/@comment-24631732-20140808060607/@comment-3257939-20140808063814

They didn't. Those are based on what they saw in the trailer. For example: Ruby's skirt and cape, Weiss' skirt and Blake's pants were not visible in the trailer and those are the only things that were wrong with this fanart.