That’s kind of like hunters who buy expensive camo and then their wife washes it with laundry detergent that contains brightening agents. To human eyes it still looks like camo, but to the deer you end up looking like Barney the Dinosaur.

Practically all of the non-bleach "whitening" detergents work by adding UV reflectivity. Humans perceive the result as brighter, without being able to accurately say why. Plenty of animals see UV light, and it wouldn't surprise me if militaries had wideband sensors beyond just IR.

This was used in Vietnam. My neighbor growing up had this condition and was a spotter in Vietnam. He'd be flown over areas of jungle in a helicopter and he would be able to easily spot camouflaged structures. He would then photograph them and mark up what he saw. He parlayed this experience into a successful career in photojournalism after he got out of the military.

Very real issue. My uncle used to be a big hunter (he died a couple years ago), and could never see other hunters wearing the required blaze orange, but when they were wearing camouflage he had no problem seeing them in the woods.

I have lots of other stories about the wierd things color blind people see and don't see. (My sisters are color blind, none of my family sees colors exactly the same, makes for some weird situations)

Funny, considering most game animals are color-blind.

Survivorship bias perhaps, on the vest products (not the animals). Only the blaze orange vests that don't trigger the animals get commercial success; word will get around what the "good hunting products" are. Probably works by having the vest be similar brightness as the camo, once you combine the reds and greens.

If that works, wouldn't wearing glasses to filter out some wavelengths work just as well?

Removing light reduces vision. Color-blind people pick up all the photons, they just don't distinguish them.