World War I helped popularize the modern bra.

For nearly 400 years, women in Western Europe and North America were expected to wear corsets beneath their clothing — restrictive, binding bustiers that cinched at the waist and opened toward the chest to accentuate the natural curves of the body. This all changed around the First World War, when a shortage of metal, the dominant material in corsets, led to a redistribution of resources as well as a cultural shift. Steel went toward planes and tanks and other military equipment, and American women went to work in factories to contribute to the war effort. ...Read More