I was a consultant for Realtree back in the day, and animals don't see the red spectrum but do see the Violet end. Therefore red in a pattern no problem, but wash your gear in a bio powder that gives you that "blue whiteness" then you may as well shine a torch.

I did a study over a couple of months and the only appreciable difference I found in any of the cammos was in the above, washing, and that was only for the crow test. Rabbits the thing was movement and noise, eventually scent.

The one thing that made a massive difference was altering your shape, a gillie suit made a huge difference to my static shooting of corvids and squirrels. Not great for stalking though..