The base coat is made of a dark red linen with black linen accents. In terms of textures and materials, the tatters are made mostly of cotton and linen from an utter rainbow of colours but with a preference for red. The tatters aren't edged and are left to fray, in time to be more ragged than it is now. The coat also has a silver stretch silk lining.
The buttons are mismatched. Each is different in design, covering a range of metals (gunmetal grey to brass to copper). The "bright, flamboyant, theatrical-looking" character this is intended for has something of a magpie mind, so the wide range of shinies bedecking the coat seemed a good idea.
To commission a similar coat from the Mercenary would cost in the region of £140-50. Email her for more details.
As usual, more photos under the cut, including one of the rejected sketches (with a different collar and a more blue colour scheme) and a close-up of the many mismatched buttons.