A longtime fashion capital of Italy and indeed the world, Milan is stepping up its sartorial experiences for style faithfuls. Over the past year, some of Italy’s top menswear brands have opened chic and sprawling new boutiques in the cosmopolis, not only staffing them with expert tailors but also outfitting them with distinctive design elements and such special amenities as plush client clubrooms and striking art installations. Style aficionados will want to check out the latest offerings from t…