From Longman Dictionary of Contemporary Englishoff the rackoff the rackAmerican English if you can buy something off the rack, you can buy it in a shop rather than having it specially made SYN off the peg British English A lot of designer clothes are now available off the rack. → rack
Examples from the Corpus
off the rack• High ready-to-wear prices, but none the less gowns available off the rack.• What I hear you saying is that I have lived my life as if I bought my clothes off the rack.• Each time I said I liked one, this guy pulls it off the rack.• Both of those editions were pulled off the racks by supermarket chains that had received complaints from customers. 