During the last 20 years there has been a dramatic technical development in the production of flat knitted fashion garments. This has made it possible to rationalize design and production of knitted products in a way that it’s possible to make a knitted garment ready made directly in the knitting machine, with a minimum of after coming processes. Starting point is a business model with the knitting machines located in the store. The customer takes an active part in the design process and garments are customized to fulfill actual demand. The objective of this paper is to develop a model for a “multiple choice” design system. The objective is also to combine the complete garment knitting technology with the area of mass customization and show how this could be implemented in the business of fashion products. The result is an overview of the area of mass customization, complete garment knitting technology and the Knit On Demand business concept. A multiple-choice system where the customer selects style, pattern, size, color and other features of the garment in order to customize the product is presented. Methodology for this paper is an inductive approach based on a literature survey and research project at the University College of Borås.