As pointed out, IR lights are a nice big "SHOOT ME" to anyone else with NVGs.
Clothing washed in regular detergeant (with the UV brighteners) makes you glow as well. Why do you think all your clothes look nice and BRIGHT in the sunlight? It ain't because one brand cleans better than the other.
Go to Sportsmans or Sports Authority and get the hunter's soap.
Run your BDUs through WATER ONLY once or twice to get the remaining soap out of them, then wash them twice in teh hunter's soap (contains no brighteners). I ONLY wash my BDUs and other tactical clothing in this stuff, ever since getting it.
Deer and other animals have a heightened ability to detect UV light, which is one reason they can see so much better when it's dark. Thus, clothes washed in regular detergent glows like you wouldn't believe.
Also, as pointed out, do not use starch in any of your tactical clothing.
It DOES make a difference.
Next, buy some Bowflage and use it on your fastex buckles. Military Moron's site has a great section on NVGs, and he shows how much paint and Bowflage (the brand of removeable paint) cover (or not) the buckles from IR reflectivity. You might be surprised.
Finally, stay away from Snugpak line of clothing unless you treat it with some anti-IR reflectivity "stuff" (which I don't have and wouldn't know where to find). I have a couple of their jackets, which are a nice OD green. At night, under natural light/darkness, the material is great.
When viewed under NVGs, however, you look like you're wearing a white t-shirt under a blacklight, esp. if there is any moon. I was appalled at how much this stuff glows. Which is a shame, because it has a REALLY good warmth / weight ratio.