* * Best man can only wear a white shirt * *. A white shirt is a versatile dress. No matter what color pants and coats are paired with, they will be very suitable and harmonious with the bridesmaid's dress. Generally speaking, the best man will wear a small vest or a suit jacket over a white shirt, which is more formal. If the couple are getting married outdoors, it would be better for the best man to wear a white shirt alone. Pay attention to the overall style of the wedding and the coordination with the groom's dress.