Synonyms of the word

off-the-peg

• adj. (of clothing, Britain) ready-made in a range of standard sizes (not tailor-made).
• adj. (figuratively) ready-made (of non-clothing items).

off-the-rack

• adj. (of clothing, US) ready-made in a range of standard sizes.

off-the-shelf

• adj. (idiomatic) As purchased or as commonly available, without modification or customization.

ready-made

• adj. Preexisting or made previously and suitable for use without (further) preparation or modification; comparable…
• adj. (not comparable) Made in advance to a standard specification.
• adj. Made or prepared in advance and used regularly or habitually without original thought.
• n. A ready-made object.

ready-to-wear

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