If you can look before you buy, take a small blacklight along and shine it on them. You can get one the size of a small LED flashlight for about $8 on Amazon, and I'm sure you can find them other places, too. Whatever camo lights up like a Christmas tree, you don't want. Deer can see UV light. Also, don't wash in a detergent that has brightening agents, because that just adds a UV sheen to the clothing.