This has always puzzled me. I have lived in the UK for many years and so often in winter see people wearing inappropriate clothing and looking very cold - e.g. a thin raincoat, bare legs or uncovered shoes.
Was also just reading a thread where the OP was asking for recommendations for a short winter jacket to wear in Paris in January and lots of people were suggesting the kind of cotton jackets I wear on cooler summer days!
Why is this??