Amelia Bloomer introduced trousers of a sort for girls as a casual alternative to formal hoops and skirts. The pattern towards feminine exposure within the 20th century tended to push the necklines of formal ball gowns lower and the skirts of cocktail dresses larger. For males, the publicity of shoulders, thighs, and backs remains to be limited to casual put on. Casual wear is a Western dress code that’s relaxed, occasional, spontaneous and suited to everyday use.