Best is choosing a colour that is also avilable as skin if there is no skin option for like the tails. How i make most chars, comparing skin with the clothing color then decide.
Unfortunately, mostly due to safeguards against unintended nudity, not all skin colors are available like normal costume colors are. Your best bet is, as mentioned before, picking a costume color and trying to match the skin color to it.
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Epic Stronghold
Block timing explained