You’ve heard of safety shoes, right? Well, here’s a safety bra straight out of the history books of home front WWII.

Via The U.S. National Archives at Flickr, the original caption reads: Safety garb for women workers. The uniform at the left, complete with the plastic “bra” on the right, will prevent future occupational accidents among feminine war workers. Los Angeles, California. Acme, ca. 1943.