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I'm simply guessing in the dark (sorry, bad pun!) here, but rather than "IR
sensitivity" are we perhaps talking about transparence/translucence in the
IR domain? Some manufacturers advertise that you can get a tan through
their fabric, although it is opaque to visible light. If so, it still
seems likely to me that any infrared passing through the fabric would be
diffracted in a complex enough way to make any signal unrecoverable.
But rather than continuing to theorize in the absence of data, may we hear
from someone who has done experiments?
Ken