Overview

A swimsuit (also called a bathing suit or swimming costume) is a piece of clothing specifically made to be worn for swimming and other activities in and near water. Swimsuits vary widely in cut and coverage, from full-body suits that prioritize modesty and sun protection to minimal designs intended for tanning or competitive performance. Fabrics are chosen to withstand wet conditions, dry relatively quickly, and remain opaque when wet.

Design, materials and features

Modern swimwear is typically made from synthetic fibers such as nylon, polyester and elastane (often sold as Lycra or Spandex). These fibers provide stretch, shape retention and rapid drying. Many garments include a built-in lining or a mesh layer to prevent transparency when wet. Some swimwear incorporates sun-protective fabrics with a UPF rating, chlorine-resistant yarns, or textured panels to improve hydrodynamics for competitive use.

Common types and styles

  • One-piece: A single garment covering the torso; common for recreational swimming and modest wear.
  • Bikini: Two-piece set with separate top and bottom; popular as beachwear and fashion swimwear.
  • Tankini: A two-piece that pairs a longer top resembling a tank top with separate bottoms.
  • Trunks and briefs: Men’s options that range from loose shorts to tight-fitting briefs resembling underwear. Classic terms include shorts and briefs.
  • Rash guards and wetsuits: Designed for sun protection or thermal insulation; used in surfing, diving and open-water swimming.
  • Specialty garments: Examples include swim dresses, swim skirts and modest wear such as the burkini, designed for cultural or religious preferences.

History and development

Swimwear has evolved from heavy, full‑coverage bathing costumes used in the 18th and 19th centuries to much lighter, form‑fitting designs in the 20th and 21st centuries. Social changes, textile innovations and leisure culture drove steadily reduced coverage and greater athletic performance. In the mid‑20th century new two‑piece styles gained widespread popularity and by the later 20th century synthetic stretch fabrics became standard. Competitive swimsuits have advanced with technical fabrics and streamlined construction; such innovations have sometimes prompted regulation by sporting authorities.

Regional names, cultural notes and distinctions

Names for swimwear differ by region and dialect. In some countries "bathing suit" or "swimming costume" are common, while in New Zealand and parts of Australia the word togs is widely used and in other Australian areas the pronunciation or term may vary (Australian English differences). Terms reflect local customs and fashions. Coverage choices also intersect with cultural attitudes toward modesty and public decency, contrasting with legal and social limits on nudity.

Uses, care and safety

Swimsuits serve multiple roles: recreational beachwear, competition gear, sun-protective clothing, and specialized equipment for watersports. Proper care prolongs garment life: rinse thoroughly after chlorine or saltwater exposure, avoid prolonged sun and heat when drying, and follow manufacturer instructions for washing. For safety, swimwear choices sometimes include high-visibility colors for open-water activities and should never replace certified flotation devices when required.

Notable facts

  1. Swimwear design balances aesthetics, comfort and function; a single style may prioritize one of these over the others.
  2. Technical swimwear used in elite competition has been subject to regulations to preserve fairness between athletes.
  3. Terminology and acceptable styles vary internationally and are influenced by cultural, religious and sporting norms.