BTW, The infrared reflective surface for these patches varies. On some of them the reflective part is the visible black part, on others it's the visible tan/green/white part. Example: the 25th ID patches that I use are reflective on the black part (the edges and the lightning bolt in the middle) the Calico Jack pirate (morale patch) is white and black and is reflective on the visible white surface, not the black surfaces.
Take a look at the patches and you'll have a better understanding of what I'm saying. I basically wear the 25th ID IR reflective patch because I don't have anymore cloth ones with velcro on them, it doesn't reflect much IR light. I'd use a 1x1 or 2x2 black square with it or replacing it.
My two cents for what it's worth.