A common term for an infants matinee jacket, originates from the Azaria Chamberlain case where baby Azaria was taken from a campsite in Central Australia in 1982, Azaria was wearing a matinee jacket at the time and the jacket was found later with teeth marks from a dingo and blood on it. The jacket had been discarded and the baby eaten, much like the garnish on a steak.
Jeezus its cold, better put some dingo garnish on the kid before we go out.