Think you can always come up with a scenario that defeats anyone no matter how well prepared.
Very true. However this actually happened to a guy in America. I saw a TV about it ages ago and its stuck in my mind since.
In the same show was the story, of a guy who used to wear camo gear all the time. He had fallen and could get help. He had gone a different way to the one he told his wife. The rescue services were looking the wrong way. Some hiker found him.
The show showed where he had fallen. You could see it from the carpark where his car was. He could not be seen with the clothing he was wearing, but if he had a red coat on he would have been seen. They proved this by having someone sit where he was found and wear the two types of clothing.
AC mentions about been told what to wear when he was on a Winter Mountain Leader course. I would take a guess and say that, that advice applies more to him working as a Mountain Leader, rather than walking on his own.