Jeans and a T-shirt have been described as the «casual uniform». With the popularity of spectator sports in the late 20th century, a good deal of athletic gear has influenced casual wear. Clothing worn for manual labor also falls into casual wear.
Basic materials used for casual wear include denim, cotton, jersey, polyester, flannel, and fleece. It is best to avoid wearing materials such as velvet, chiffon, and brocade.
While utilitarian costume comes to mind first for casual dress, however, there is also a wide range of flamboyance and theatricality. Punk costume is a striking example. Madonna introduced a great deal of lace, jewelry, and cosmetics into casual wear during the 1980s. More recently, hip hop fashion has played up elaborate jewelry and luxurious materials worn in conjunction with athletic gear and the clothing of manual labor.
Casual wear is typically the dress code in which new forms of gender expression are attempted before being accepted into semi-casual or semi-formal situations. An obvious example is masculine jewelry, which was once considered shocking or titillating even in casual circles, and is now hardly noteworthy in semi-formal situations. Amelia Bloomer introduced trousers (of a sort) for women as a casual alternative to formal hoops and skirts. In a recent mirror image, sarongs and other skirts have been embraced by a few men of the European tradition as a casual alternative to formal trousers. Both of these innovations caused great embarrassment in formal circles.
The trend toward female exposure in the 20th century has also pushed the necklines of formal ball gowns ever lower and the skirts of cocktail dresses ever higher. For men, the exposure of shoulders, thighs, and backs is still limited to casual wear.