Scarlet
The threads a criminal wears will always be scarlet. Scarlet is the color of freshly spilt blood, which is why bad guys wear it so much.
Picture a person wearing all scarlet all the time. Don't they give you a criminal-y vibe?
ひ
あか, あけ
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This scarlet color holds a lot of heat (ひ). Scarlet is the color of fire, and it has the heat of fire too.
Picture a criminal, covered in this scarlet thread, heat radiating off of him.