Mass-produced or ready-made; not tailored or specially designed: Buying an off-the-rack reno is expensive and not very adventurous(1963+)
Idioms and Phrases with off the rack
off the rack
Ready-made, as in She has all her clothes made; she never buys a dress off the rack. The rack here is a frame from which clothes are hung. [ Mid-1900s ]
A British synonym is off the peg, similarly alluding to a knob from which clothes are hung and dating from the late 1800s. Also see: off the shelf