horse and buggy

and horse and carriage; buggy whip

Fig. a carriage pulled by a horse, as opposed to a modern automobile; the horse was urged on with a whip. (A symbol of old-fashionedness or out-of-dateness. Particularly with go out with, as in the examples.) That kind of clothing went out with the horse and buggy. I thought suspenders went out with the horse and carriage, but I see them everywhere now.