My favorite suggestion was offered to me by a newly married friend as what she considered a 'must have' for her groom--AN EXTRA TUXEDO SHIRT. During the day, especially if you're having a summer wedding or if you're serving pasta, tuxedo shirts can take a beating. So rent an extra for a back up--just in case. This way your wedding photos will have a groom who looks well groomed, even at the end of the day.