And if you are stuck for an evening outfit as the nights grow chillier, don't forget the allure of a simple black cashmere polo-neck with black pants, accessorized with a single long string of pearls.
Arriving at a meeting at the Kremlin wearing a polo-neck sweater instead of a shirt and tie is rumoured to have been one of the reasons why Mikhail Khodorkovsky and Yukos, his oil company, were destroyed by the government.