Riddle Me This

With the temperatures hovering around 55 degrees, it's quite pleasant in Paris. Yet you look around and everyone is bundled-up like it was the depths of winter. But when the temperature drops to near freezing, people walk around with less clothing. Riddle me this: why does a Parisians outerwear never sync with the weather? More strangely, even though they find it uncomfortably cold, they'll sit or drink outside under scattered heat lamps. Go figure.