Casual wear (or casual attire or clothing) is a Western dress code that is relaxed, occasional, spontaneous and suited for everyday use. Casual wear became popular in the Western world following the counterculture of the 1960s. When emphasising casual wear's comfort, it may be referred to as leisurewear or loungewear.
While casual is "informal" in the sense of "not formal", informal wear traditionally refers to a Western dress code associated with suits—a step below semi-formal wear—thus being more formal than casual attire.
Modern casual fashion can be traced to fashion sportswear from the 1920s, including tweed blazers, oxford shoes, and golf skirts. An increase in the popularity of bicycling brought about a need for culottes, a forerunner for casual shorts. As the century progressed, "casual" came to encompass more styles, including denim workwear and elements from military uniforms. With the popularity of spectator sports in the late 20th century, a good deal of athletic gear has influenced casual wear, such as jogging suits, running shoes, and track clothing. Basic materials used for casual wear include denim, cotton, jersey, flannel, and fleece. Materials such as velvet, chiffon, and brocade are often associated with more formal clothes.
While casual dress evokes utilitarian costume, there is a wide range for expression, including punk fashion and fashion inspired by earlier decades, such as the 1970s and 1980s. Madonna popularized lace, jewelry, and cosmetics into casual wear during the 1980s. In the 1990s, hip hop fashion played up elaborate jewelry and luxurious materials worn in conjunction with athletic gear and the clothing of manual labor.
Casual wear introduced a "unisexing" of fashion. By the 1960s, women adopted T-shirts, jeans, and collared shirts, and for the first time in nearly 200 years, it was fashionable for men to have long hair. Casual wear is typically the dress code in which forms of gender expression are experimented with.