People ought to be careful with the going outside thing. Like, if you're just going out into your yard or apartment complex then it's fine. If you're commuting and there's the possibility that you might end up stranded where there's no climate control, then please at least stick that extra layer in your backpack or something.

I had somewhat severe hypothermia once, and it's an insidious thing. I got colder and colder until I just stopped noticing it, and then I stopped noticing most things. I didn't realize what was happening to me, and I would have died if I had been alone. I had others who saw my slack, dumb face and my kinda blue lips and helped me, but I'm not going to risk ever going through that again, and I'd encourage everyone to please be careful. Keeping a coat or hat or whatever with you is worth the hassle.