This was made by my Friend and D&D buddy Senpai Satan. Spring Glow is a Kirin in the Fallout Equestria Universe. A survivor from before the bombs that somehow survived in her Stable 8. Having no memory of what happened she travels the wasteland.

The story on this one is that this dress was made by Rarity to be a magically enchanted dress. The flames on it in game would be animated.

While I don’t have a image source I do have a Deviantart to point to in general: https://www.deviantart.com/senpai-satan