A "dress uniform" is a special outfit worn by people in specific professions or during formal occasions. It often has a more formal design and includes unique badges or decorations to show a person's rank or affiliation. Full definition
After all, black patent leather shoes are part of the military dress uniform — how could they not be conservative enough? (corporette.com)
The funeral was attended by military veterans in dress uniform and members of the Patriot Guard Riders. (local10.com)
He recalls that over the next few days, the Marines took care his father's burial preparations — dressing him in his full Kenyan Army dress uniform, and arranging for them to fly home for the funeral. (businessinsider.com)