Final answer:
Leg makeup came into use during World War II because of rationing restrictions on nylon, which created a shortage of traditional hosiery for women.
Step-by-step explanation:
Leg makeup was marketed as a result of rationing of nylon during World War II. Rationing affected many areas of American life, including fashion and personal care. People conserved whenever possible and adhered to government-controlled rationing programs, which limited public access to products like gasoline, food items, and clothing.
Due to the need for manufactured fabric for military uniforms, there was a nylon shortage for civilians. Women, as a result, went without nylon hosiery and started using leg makeup to maintain their appearance. They also drew seams on their legs with dark pencils, as nylon stockings typically had seams at the back. Rationing was linked to patriotism through massive propaganda campaigns, making frugality and conservation a national duty.