Hi,
there’s a missing set of textures for the apparel NY_SoldierClothPlus.
The current texture folder:

Things/Apparel/NY_SoldierClothPlus/
NY_SoldierClothPlus.png
NY_SoldierClothPlus_north.png
NY_SoldierClothPlus_south.png
NY_SoldierClothPlus_east.png

The XML definition has <genderSpecific>true</genderSpecific>, so the game is looking for files like:

NY_SoldierClothPlus_Male_north.png
NY_SoldierClothPlus_Male_south.png
NY_SoldierClothPlus_Male_east.png
NY_SoldierClothPlus_Female_north.png
NY_SoldierClothPlus_Female_south.png
NY_SoldierClothPlus_Female_east.png

Since these files don’t exist, the game throws:

Failed to find any textures at Things/Apparel/NY_SoldierClothPlus/NY_SoldierClothPlus_Male...

Possible fix:

Add the _Male and _Female variants (even if they are copies of the existing ones),

OR set <genderSpecific>false</genderSpecific> in the ThingDef to use the current non-gendered textures.

Thanks for your work on the mod!