"The dearth of fashion options on the very edge of the world can be partly addressed with a Sweatshop, which produces low-quality knockoffs of Imperial clothing designs that were popular in the Capitol about a year ago."
— In-game Description
The Sweatshop is a shops that makes goods for the Goods category. A hefty build requirement means you may not want to make use of it, but it can be useful for handling production of Goods to bolster your income in the late game.
The Sweatshop is used extensively for making goods needed to complete missions.