This photograph from 1917 or 1918 shows a classroom in Germany, in which the schoolgirls are knitting socks and other garments. This clothing was intended for the soldiers at the front.
Everyone works in Germany: School children in domestic science classes learning to knit socks for the soldiers in the field: Good propaganda picture: Note Kaiser between biblical subjects on the wall, black-and-white photograph, 1917–1918, photographer: Brown and Dawson; source: National Archives and Records Administration, https://catalog.archives.gov/id/31480158.