MILAN — Karl Lagerfeld celebrated Mad Max, of all people, in the spring Fendi collection he showed on Tuesday. And the result was a Tough-Chic combination of beautiful clothes in autumnal colors, often with diaphanous, flowing shapes, and lots of great leathers. Here, one intriguing blend of patchwork, sheerness and frills. For more on the shows, see pages 4 to 6.