Dragoon mounted

D R 16 had yellow collar and cuffs .Also his hat band would be yellow .
I know that sometimes yellow for some reason shows up darker in old
B & W photos , but these colors are pretty dark
Steve
 
As Steve said the orthochromatic film of the era does not show colours accurately and can often reverse tnem. Especially yellow which almost always looks black.

As for a Dragoner riding an officers horse with the horse’s tack, it was a common practice for the men to exercise the officer’s horses daily. Officers in Garrison were often elsewhere doing officer stuff.
 
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