British Medical Staff, Medical Department, and Commissariat Uniforms, ca. 1868?

[EnclavedMicrostate]

Question as it is on the tin – is there any sort of guide for uniforms for the Medical Staff Corps (i.e. orderlies) and Army Medical Department (i.e. surgeons) at the close of the 1860s? Apparently there was some sort of uniform change after the merging of the two entities in 1884 into the Army Medical Staff, so I'm now flailing a bit trying to find out, at the very least, if one or both were wearing scarlet rather than blue at this stage.

EDIT: Oh and also, what about the Commissariat? I've got a couple of Zulu War Commissaries I don't have much other use for, but if the sort of braided patrol jacket was already a thing for the Commissariat before the 1869 formation of the Control Department, that seems like a plus as well.