My parents were very particular about following all the published rules. Winter coats were a good example.Bundle up or you'll get sick. Ah no, just cold!!
If the temperature in the morning was 45 and rising, it was OK to wear the lighter jacket to school. If it was less than 45, or if the temp wasn't rising, it had to be the heavy coat. These rules were so heavily ingrained that even today if I see a kid wearing just a hooded sweatshirt I think to myself, it is only 40 degrees, how did that kid's mom let him out of the house?