The potential problem with that is complexity. This would be meant first to prevent absolute re-posts, re-posts with no differences at all. Although, to go from your idea, perhaps it could somehow break the skin into multiple pieces, each piece being one side of a body part, and look for similarities to the body parts of others, and raise a flag for the moderators if it finds something that is exactly the same. The main problem that I can see with looking for similar (and not exactly the same) parts is teaching it what would count as being similar.
Status: Accepted
Opened by DestructionE
The ability to search for a skin if you have the actual skin file.