There are lots of references on Google. I presume you want more than this:
Order L-85, first announced in 1943, affected every kind of clothing produced in America except for wedding gowns, maternity clothes, infant wear, and religious vestments. The guidelines outlined by the government dictated that only one and three-fourths yards of fabric be used per dress. The purpose of Order L-85 was to discourage any change in fashion that would necessitate adjustment of machinery, technique, extra labor, or changed consumer expectations. The government wanted all its resources directed at winning the war, which meant that every yard of cloth, every button, and every silk stocking was seen as crucial to victory. Yet the government did not have to define strict guidelines for every aspect of fashion. The market did much of that, as fabrics and supplies dwindled.