From OpenKnit:

OpenKnit is an open-source, low cost, digital fabrication tool that affords the user the opportunity to create her/his own bespoke clothing from digital files. Starting from the raw material, the yarn, and straight to its end use, a sweater for example, in about an hour. Designing and producing clothes digitally and wearing them can now happen in the very same place, rewarding the user with the ability to make decisions regarding creativity and responsibility. (homepage) (full instructions for a Wally120 open-source knitting)