I'm sure even if the top black jacket is difficult to remove from the figure, the excess dye could be removed from the collar simply by wetting and removing water with a dry cloth a few times. It's no different to washing a new black T-shirt made in China. Wash it in a bucket and I guarantee the water is not clear when you're done.
Hmmm I didn’t think about that..washing the shirt might work, but won’t the material get ruined