As for the black clothing...Well. DF says undyed cloth is gray... But gray (50/50) doesn't look good, so I use a darker gray. The fur on the goblin is troll fur, gray aswell.
In gameplay terms probably, but Kenaf, hemp, and jute seem to be more of a beige, cotton and linen more of a light gray or maybe white, ramie's a bit of a medium-to-light grey, and I would imagine rope reed stuff to be more of a brown, with Pig Tails and troll wool being a true medium. Wool from other critters would vary from animal to animal.
Plus there's the matter of dyes which allows a bit more creative freedom (no reason goblins
wouldn't have black, green, red, or blue clothes after all. They can be dyers too.)
Finally finished some character drawings, one of a Grey Hat hacker named Katja Holland on one of her few trips into Redwood (not fond of the regular near death experiences those trips entail.)
And one of Apolonia, a hideous amalgamation of poloish cavalry history (modern knee and elbow pads, 1930s revolver, a Napoleonic dress uniform, and renaissance era metal armor and boots, with some modern paint/dye on both.) Created and drawn as a thank you to someone for making the hive beasts I need for a bee-based fortress project. She's a nutty one, and probably wouldn't look out of place in 40k as part of some strange pan-slavic themed guard regiment.
I need to do more dynamic stuff, but character art is at least something to give me ecessary practice in other areas at least.