What did Fantine do for a living in les miserables?

In Les Miserables, Fantine is a worker in a factory owned by Jean Valjean. The nature of the factory's products are not specified. However, Victor Hugo's 1862 novel clarifies that she arrives in Montruil-sur-Muer to take the job after being abandoned by the father of her child, and dropping her daughter off to be taken care of by an innkeeper and his wife.