BLUES BROTHERS: Italian industrialist Renzo Rosso was spotted in the front row of the Marios Schwab show on Monday. Also in tow was Nicola Formichetti, the new artistic director at Rosso’s Diesel brand, and Giovanni Pungetti, chief executive at Maison Martin Margiela. All parties insisted there was no project brewing with Schwab. “Marios is one of my best friends,” Formichetti said, noting the Diesel crew is in London to do research for the collection he will present in March. “We’re in London looking at vintage items, and we thought why not come to the show?” said Rosso.