off-the-rack vs ready-to-wear

off-the-rack

adj
  • ready-made in a range of standard sizes 

ready-to-wear

adj
  • Describing apparel that does not need any tailoring (for example hemming) before it can be worn. 

How often have the words off-the-rack and ready-to-wear occurred in a corpus of books? (source: Google Ngram Viewer )