Use ItemType.dat to find particular items, and you can work out the name of the textures from it.
I'll take a PineRobe as an example.
The ID of the first PineRobe entry in ItemType.dat is 139393
So the general ID of Pine Robes is 139xyz.
x is the color of the robe (3=orange, 4=light blue, 5=red, 6=dark blue, 7=yellow, 8=purple, 9=white)
y is the level of the item relative to the lowest level of that type. (TaoRobe=1, MaskRobe=2 etc.) 120 textures are excluded from this, but you can see how to fin textures for them.) For 120 armors make this zero
z is the quality of the item, and had no difference on the armor texture. Should always be zero.
Now you just need to add a digit at the front of the ID for the player its for (1=small female, 2=large female, 3=small male, 4=large male)
Back to that entity I found for PineRobe. (139393). If i want to find a Red large female texture, I add on the digit for large female (2139393), change the color to red (2139593), and make the 'quality' zero. (2139590), and make y zero because its a level 120 robe.
The ID I get is 2139500.
Go to 3dtexture.ini, and search for the ID you just found, and it gives you the path and filename of the texture. In this case 2139500=c3/texture/002139500.dds
Textures not visible in Conquer 1.0\c3\ are actually in the c3.wdf file, its packed full of them. You can extract the files you want using the filename you got from 3dtexture.ini. I'm not posting how to do that here.