Seamstresses and tailors all do alterations on clothing, but seamstresses also tend to alter other non-clothing items such as draperies. A tailor tends to work more on men's suits and coats but also works on women's pieces such as fancy dresses and ball gowns.
Both seamstresses and tailors work in dry cleaners, alteration services, and even higher-end fashion stores. Seamstresses also commonly work in bridal stores altering wedding dresses, bridesmaid dresses, and ball gowns. Tailors often work in men's suit stores where they alter shirts, suits, and trousers.