After World War I
Shortly after the United States' entry into World War I in 1917, the U.S. War Industries Board asked women to stop buying corsets to free up metal for war production. This step liberated some 28,000 tons of metal, enough to build two battleships. The corset, which had been made using steel stays since the 1860s, further declined in popularity as women took to brassieres and girdles which also used less steel in their construction. Corsets fell from popularity during the late 1910s but forms of body shaping undergarments often called corsets continued to be worn well into the 1920s.