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Robes Preview
My recollection is that they were related to reading off information from the game's files. Of course, I also don't know anything about the structure of a wiki so it's not like I can really tell what those things are reading.
The only thing being read off as far as the image is concerned is the name of the item, besides that we have a specific format for item preview templates on item pages.
A regular piece of equipment like Akule's Outfit is named like:
File:Akule's Outfit Equipped Front.png
Wheras robes are named like:
File:Mysterious Robe Equipped Male Front Hood Up.png
and
File:Mysterious Robe Equipped Male Front Hood Down.png
Unisex equipment are named like:
File:Karis Wizard Suit Equipped Male Front.png
and
File:Karis Wizard Suit Equipped Female Front.png
The point is that items that do not end in Equipment_Front do not get previews in list because the template we made for them doesn't address those kind of alternatively named images yet.