Well, sweater and coat I can sort of understand. I mean if your whole body is freezing, doesn't it make you more susceptible to catching a cold?The key word here Josh is "old" it's an old wifes tale that by being barefoot or not wearing a sweater/coat in cold weather is going to cause peolpe to get colds.
In my case, I had cold feet but the rest of my body was warm. So no real issue here unless cold viruses/bacteria infect you through feet which as far as I know, isn't the case!