Post: #2

The weird colors are caused by the CanUse attribute and t_equiptem event. It happens that some items, when created, get a weird value in their CanUse attribute.

One of these items is the checkered shirt, an item that is almost present in every vendor NPC:
ITEM=random_shirts_human // This includes the checkered shirt

So the NPC can't equip it (notes that the item is not placed at all in the world), then if we take a look at the following line we see this:
COLOR=colors_all

For some reason (probably because it can't equip it and the item is not placed in the world), the color will be applied to the npc skin value.

So possible solutions are :
Apply the CanUse = can_use_all in the Itemdef of each item that doesn't have it, or modify/remove the t_equipitem event.