Source : Webster's Revised Unabridged Dictionary (1913)

Service uniform \Service uniform\ (Mil. & Nav.)
   The uniform prescribed in regulations for active or routine
   service, in distinction from dress, full dress, etc. In the
   United States army it is of olive-drab woolen or
   khaki-colored cotton, with all metal attachments of
   dull-finish bronze, with the exceptional of insignia of rank,
   which are of gold or silver finish.