It is probably more important for birds than mammals. Mammals probably see more outlines especially if they are high contrast compared to the background, like pure whites or pure black clothes with no pattern. Ive heard that when bush stalking, bright skinned hands are a dead giveaway, so I always at least wear fingerless gloves with a neutral color or camo. Two dark spots (eyes) on a pale face may also scare prey animals. But thats just hearsay, haven't done any experiments.
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