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.