Synonyms for Dickie (same or very similar meaning)
WordNet sense 1 (a small third seat in the back of an old-fashioned two-seater):
dickey, dicky, dickey-seat, dickie-seat, dicky-seatWordNet sense 2 (a man's detachable insert (usually starched) to simulate the front of a shirt):
shirtfrontFrom the ODE community, based on WordNetadd/edit