Sir Rod Stewart has enjoyed getting his family together for a luxury yacht trip and wore a very stylish outfit for the occasion. The rock and pop star, 79, gathered his family as they enjoyed quality time together at sea in the Mediterranean. He was joined by wife Penny Lancaster and grown up children Ruby, Sean and Kimberly. The dad-of-eight also had his grandchildren on board for the family holiday. In one snap, Rod rocked a black and white striped number featuring a blazer, shorts and shoes in the matching pattern. He then topped off the look with a black and white polka…