What do you call a woman who sews clothes?

What is a Seamstress?

A seamstress is an individual whose profession revolves around sewing garments. You might consider yourself a seamstress if you alter your own trousers, but the majority of seamstresses operate in factories, using sewing machines to create clothing. Historically, a seamstress referred to a woman who sewed seams using a sewing machine or occasionally by hand.