Search and rescue here.
Lost/ injured hikers in bright colours are found pretty much straight away, helicopter spotters can see them from literally miles away.
Geometric, reflective, colourful, moving, silhouette, yea you get found, line search finds you just as easily but the reality is that line search can only cover a very small area.
People who wear camo just aren't found. If we hear someone set off in camo do we even send a helicopter at all? Line search where? We run the trails but the fool could be ten meters off the trail hiding, unconscious, we might just miss them. Often the person is found in an altered state, mental health, drugs, fatigue, dehydration, paranoia, ask of the above. They need help or they might die, but don't realise that
We're also suspicious of people in camo because they could be trying to ambush other hikers. I've had very stem words in the back of the truck with hikers who set off in plain clothes and were subsequently found in camo. Many hikers will immediately report someone in camo as a personal safely threat and they're not dumb for doing that.