Victorian Volunteers’ uniform
According to Trove, this studio photo from the Victorian State Library collection shows a Victorian Volunteers’ uniform worn for the first time at Sir Charles Hotham’s funeral. Unfortunately, it does not state which volunteer group. According to a report of the funeral (see below), there were in the procession members of the Victoria Volunteer Artillery Regiment and the Yeomanry Cavalry. It looks closer to that of the Collingwood Company of the Royal Victorian Artillery ( http://www.austbuttonhistory.com/uncategorized/1st-november-2020/) than the Yeomenry ( http://www.austbuttonhistory.com/uncategorized/28th-october-2020/), so I guess it is of the Artillery. If so, the hat later gained a plume.