Another important factor is to NOT use any clothes washing powder with whitening or brightening substances, these Fluoresce under UV light.
I was part of a study here in Australia that we had a pen with 1000 acres that housed wild Sambar deer. The tests involved checkered shirts with red/black, blue/black and green/black. Washed with regular detergent and whitening. The deer didn't care about the red/black even when washed in whitening detergent, but all the other colours they would react to. Any whites was like a beacon to them, as was blue jeans. The best colours were drab kakhi, browns and even black. Camo made very little difference.
Blaze orange/yellow made no difference either.
Cheers.