Ditto is a pattern-projection system for home sewists that combines algorithmic intelligence with digital projection to make patterns paperless, customizable, and adaptable to specific body measurements—all in real time. This system is the first evolution of paper patterns since their invention in 1860. The Ditto website (dittopatterns.com) allows the sewist to customize a pattern’s style and measurements. The pattern library is downloaded to the Ditto app, where users can lay out pattern pieces in their workspace and send them to the projector for projection onto the fabric.