Women started wearing trousers in the early 1900s, according to Fashion Encyclopedia. Many women wore pants to perform outdoor work. During World War I, women wore pants while working in factories or performing other laborious tasks.
After the end of World War I, many women did not want to give up wearing trousers. However, the idea of women wearing pants was still considered controversial by society. During World War II, women started working in factories and wearing pants again. After the war, women continued wearing pants as casual wear. By the 1960s, pants became a fashion staple, and it was a widely acceptable practice for women to wear them.