Here is a picture of khaki serge tunic that was worn in South Africa by Joseph Cooke, 3rd Contingent.
This tunic was once owned by Lieut Col T C Wallace, who also use to own a khaki drill tunic with imperial buttons and riding trousers that were also worn in South Africa, unfortunately the letter I have from Wallace does not mention who the original owner was.
Uniform - Joseph Cooke NZMR 3rd Contingent..jpg