I live in Livorno -Tuscany, west coast and sometimes I work in Lucca, Firenze etc. and it can be very hot. For me it's mocassins (always with socks!), staprest or creased trousers, shirt (90% + tie) and lightweight jacket at work. Mocassins/loafers, bowling shoes or driving shoes chinos/staprest/white jeans, check s/s shirts, poloshirts (always buttoned up), cycling tops, boating blazer either with shirt&tie or poloshirt in spare time.