Want to get these terms clear in your head for once and for all? Read on:

Ready-to-wear or prêt-à-porter is the fashion design term for clothing marketed in a finished condition, in standard clothing sizes (in casual usage, off the rack or "off-the-peg"). Some fashion houses or fashion designers create ready-to-wear lines that are mass-produced and industrially manufactured, while others offer lines that are very exclusive and produced only in limited numbers and only for a limited time. Whatever the quantity produced, these lines are never one of a kind.

The antithesis of ready-to-wear is different depending on whether it concerns women's or men's fashion. In women's fashion high-end clothing made partly incorporating features requested by the client and to her exacting measurements is called haute couture.

e.g. Chanel, Dior, Lacroix etc.

In menswear, it is usually called bespoke.

e.g. Savile Row, Cesare Attolini, John Lobb shoes etc.