Incarnadine Legplates do not show plate texture.
 

1. Equip Incarnadine Legplates
2. Observe that the item has no plate armor texture; instead your character's legs simply become Incarnadine-colored and look as if you have no pants equipped.

Reproduced on a Troll Shadow Knight, unsure if this effects other races the same way.

https://i.imgur.com/V1kkySp.png

It affects ogres the same way.

Is there any in era evidence of the legplates having plate texture?

Everlore has nothing...

http://web.archive.org/web/200211272...how&IID=173631

Casters Realm has nothing...

https://web.archive.org/web/20020105...em.asp?Id=1460

/shrug

Those are Incarnadine Greaves. Incarnadine Legplates are a separate item.

Greaves:

http://wiki.project1999.com/Incarnadine_Greaves

Legplates:

http://wiki.project1999.com/Incarnadine_Legplates

Not having much luck finding anything substantial. No one said anything about it having a cloth or chain texture on the following resources:

http://everquest.allakhazam.com/db/item.html?item=12120

Some people seem to have mixed the greaves and the legplates up, and it didn't look like it was even submitted to sites until later due to this confusion. The greaves look like plate though. The legplates aren't even listed separately until later, just made comments about that showed their existence in obscurity.

http://web.archive.org/web/200201120...html?item=1358

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There is this snippet from the Daybreak TLP Forums:

“...
Got Incarnadine Greaves that inexplicably looks like a red skirt on my Ogre SK due to being chain graphic for no apparent reason, despite the fact all other Incarnadine armor looks like plate.
...”
Plate armor ornamentations can go in armor flagged either Plate OR Chain (and vice versa for chain armor being able to use plate ornaments). Same deal for Leather/Silk being interchangeable.

The Incarnadine Greaves seem to be properly flagged as Plate, though there is an old set of Incarnadine Legplates which as far as I can tell no longer drop (maybe only on TLP servers for a specific time) that were ?mistakenly? flagged as cloth which would be why your plate ornament wouldn't go in them.
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https://forums.daybreakgames.com/eq/....250196/page-2

Note that the original quote appears to have been deleted for whatever reason, so I wasn't able to find that.

So still no idea if it was plate graphics or not, but I figure someone would have mentioned it NOT being a plate graphic for plate classes on any of those links, since it was commented on immediately in other implementations.

I'll keep looking and see what I can find. But at the moment, I don't know. Maybe they were using cloth graphics?