Hey, so, this is a bit of a weird question, but I think I've heard some things in the past about civ/entity "uniforms" (still not entirely sure what that term entails) having a certain common colour. I'm not sure if this is actually the case, but if it is, what exactly does color mean? It's not presented in any identifiable way in-game (for example, you don't look at a cloak and see "red (insert fibre of your choice) cloak" or anything like that. Is the "color" of items defined by the materials themselves? And on that subject, is it possible to give clothing and the like randomized or organized colouring? For example, everyone in a civ wearing clothing/armor of the same colour, or people wearing randomly coloured clothes?
I haven't messed with it much myself, but from what I can gather, it would seem that the color options for uniforms, lets you.. well.. specify the color of the (non metal) items in the uniform. For example, if the uniform includes clothing as well as armor, such as cloaks, hoods, mittens ect, then it will use ones dyed the specified color if at all possible.
Assuming you aren't using any plant based mods, then you're pretty limited on your color options; dark blue (from dimple cups) is always possible, and the other 3 colors, red (hide root) black (silver barb) and light green (blade weed) are only available if they happen to be growing on the surface for you to harvest/grow.
Using workshops set to take from stockpiles that only allow the specific dye you want to use will let you choose what color you dye your thread/cloth that you use to make the clothing.