I first saw this outfit in the movie "Elizabeth," where they did an amazing job making Cate Blanchett look like the young adult Queen when she had her coronation. They had her look as she did in her portrait, and showed her wearing the dress without all the crazy extra stuff on for the ball held afterwards. She was also featured in posters for the movie wearing that dress.
This image was relatively easy to imitate, though the only robe they had available for the Queen to wear was red. In the portrait, she's shown wearing a golden robe. I couldn't have her holding the Orb and scepter b/c her hands were in the wrong positions to do so. Her face I based off of my imitation of her 13-year-old portrait.