In Hong Kong, beside the mandatory umbrella, you better carry a jacket and a scarf wherever you go. Yes, in Summer as well. Not so much because of the weather: temperatures easily soar past the 35 degrees centigrade mark in Summer and very rarely drop below 10 degrees in Winter. No, in fact you’ll only rarely need to put on your jacket in the street. That’s what you would do anywhere else in the world. In Hong Kong, however, things are done the other way round: T-shirts are worn in the street; jackets, coats, and scarves are worn at home and at the office. The reason for that rather peculiar dressing routine? The air-conditioner…