My fiance' and I are getting married in the fall and he selected a cousin of his to be a groomsman. His cousin who is now out of the military wants to wear his dress blues during the ceremony instead of a tux. None of the other members of the wedding party are involved in the military and will be wearing a tux. I fear that one groomsman wearing something different will upstage the wedding. I'm not sure if I am analyzing the situation too much. Can someone tell me the etiquette for wearing dress blues as a member of the wedding party, within a civilian wedding?