Vestments and Accoutrements
The difference between the civilian and military uniforms is the former wears the cross hanging from a green crown of laurel, whereas the latter have the cross hanging from a trophy. A green uniform was later prescribed by Pope Pius IX. The uniform contains a black beaver-felt hat decorated with black silk ribbons, silver metallic twisted rope, buttons and black ostrich feathers. The jacket, made of green wool, is trimmed with silver metallic thread, and has a tail, nine yellow metal buttons in the front and three buttons on the cuffs and is lined with black satin. Finally, the costume contains suspenders, several yellow and red rosettes, white leather gloves, and a short sword with a handle made of mother of pearl with a medallion of the order at the end.
Knights Grand Cross wear a sash and a badge or star on the left side of the breast; Commanders wear a cross around the neck; and Knights wear a smaller cross on the left breast of the uniform:
Read more about this topic: Order Of St. Gregory The Great