Hi Dave,
I was able to find some more information with regards to the manufacture of the Coronation Uniforms for the Australian Contingent as per the article below which describes the same design for all the attending States -
(The Express and Telegraph, Adelaide, SA, Tuesday 29 Apr, 1902)
Other information that was able to be sourced from the Australian War Memorial (AWM) indicates that when the Australian Coronation Contingent arrived in England they were issued with a new uniform which was made by the firm, Hobson & Sons of London. Information from the above article indicates that this might not be the case.
A digitalised coloured portrait of Sergeant Philip Selwyn Allen wearing his dress uniform, as a member of the Australian Coronation Contingent representing the State of Western Australia. Sergeant Allen initially served as 38 Private Allen with the 1st West Australia Mounted Infantry before re-enlisting once again with a rank of (49) Corporal serving with the 5th West Australia Mounted Infantry. I hope that the coloured image is as close to the original colour of the issued uniform, but it is hard to say when you look at the colouring of the medal ribbons. I believe that the artist may have used the next portrait from the AWM as a template.
Description from AWM.
Studio portrait of Corporal (Cpl) Thomas Lackey Cunningham Shields, Australian Commonweath Horse. Cpl Shields is wearing full dress uniform, as a member of the Australian Coronation Contingent sent to London for the coronation of King Edward VII in 1902. He is wearing the Coronation Medal and the Queen's South Africa Medal with three clasps. His hat displays the white metal second pattern Rising Sun badge, fixed to a green cloth backing. Formerly a farmer from Warrnambool, Victoria, Cpl Shields had served during the Boer War as 1132 Private Shields, 5th Victorian Mounted Rifles.
Description from AWM.
Australian Commonwealth Horse (2nd pattern) oxidised brass hat badge with Rising Sun pattern rays, curved 'AUSTRALIA' over a tudor crown, and underneath a scroll with 'COMMONWEALTH HORSE'. The words on the badge have been highlighted by rubbing back the oxidisation to show the brighter brass. Badge is mounted on dark green cloth, edged with white stem stitch embroidery, cut in the pattern of a five petalled tudor rose. Badges with this cloth backing were worn by members of the Australian Commonwealth Horse selected to attend the coronation of Edward VII in London in 1902.
Trev