Ready-to-wear (or prêt-à-porter; abbreviated RTW; "off-the-rack" or "off-the-peg" in casual use) is the term for ready-made garments, sold in finished condition in standardized sizes, as distinct from made-to-measure or bespoke clothing tailored to a particular person's frame. In other words, It is a piece of clothing that was mass produced in different sizes and sold that way instead of it being designed and sewn for one person. The term off-the-peg is sometimes used for items other than clothing, such as handbags.

Ready-to-wear has a rather different place in the spheres of fashion and classic clothing. In the fashion industry, designers produce ready-to-wear clothing, intended to be worn without significant alteration because clothing made to standard sizes fits most people. They use standard patterns, factory equipment, and faster construction techniques to keep costs low, compared to a custom-sewn version of the same item. Some fashion houses and fashion designers make mass-produced and industrially manufactured ready-to-wear lines, while others offer garments that are not unique but are produced in limited numbers. Ready-to-wear clothing has become faster to produce due to advancements in communication technology. In order to track production at distant sites and cut costs even further, some mass-market firms use video-conferencing and other sophisticated technologies to send and receive information, thereby ensuring product quality without the need to travel to the producer. Ready-to-wear clothing and or ready-made garments have truly expanded the fashion industry and all while making clothing more affordable and accessible to all, in all forms of shopping, making for the most convenient option out there.