The tech does exist, and I am quite sure with the sideways eight of a defense/security budget we currently have, it can be refined rather well.
I knew there was a reason I wore lots of black.
The natural thing to do is point the cam at targets whose clothing is slightly see-through to the naked eye, like a white cotton T-shirt. But in fact, dark coloured clothing which you cannot see through at all by eye is the best because it reflects far less visible light than white. Remember that infrared light has a longer wavelength than visible light and behaves differently.
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