Air Scotia, you really have little understanding of just how your ideas may play out.
Imagine the scenario when in an emergency the passengers are told to put on external clothing. Everyone stands up and tries to get into the overheads for coats and jumpers. The aircraft, possibly already in a partly unstable condition, may suddenly become out of trim as people push and shove to get their coats etc, in many cases not in an immediately adjacent bin, thus addingto the problems of the crew.
Then it maybe a landing on water is a possibility so life vests have to be donned. In your world where people can't even find the one hole in a life vest to put it over their heads, how on earth are they going to cope with two requirements, coats and life vests.
Admit it, sitting cosily and happily at your computer your only concern is to exit a crash scenario with everything you took on board. I dare say were you ever in a real evacuation you would be pushing and shoving with the rest to get out and as far away as possible before the situation deteriorated to one of unsurvivability.