If you have a white dog you'd like to style as Amaterasu (and who is a good boy like Dante -- good boy!) his owners detailed the process of making the costume on their blog. Happily, the whole thing was conceived from the perspective of what would be best for Dante; even the decision to bring him to Otakon in the first place was explained as "this was better for him than leaving him in a boarding place for five days." The whole post is full of tips and disclaimers about ensuring your dog's happiness and comfort while also making it look like a video game character.
Basically, our hearts were warmed twice by this story. And then a third time when our eyes drifted back up to the picture.