i Register
In some senses, off-the-peg is marked as figuratively, UK. Watch for register when choosing this word.
adj
Ready-made in a range of standard sizes (not tailor-made).
Modern mothers seem not to have time to make dollies' wardrobes from scraps of this and that. As most of their own clothes are bought off the peg, not many scraps are available, and indeed many of them cannot sew.
Ready-made (of non-clothing items).