The purpose of this study is to present a new vision for high value-added knit wear design by designing and producing knitted one-piece dress by digital textile printing which based on digital making a new industry, culture, and lifestyle in a new millenium. According as casual fashion is more and more popular, preferring knit wear, a key item of casual fashion, continues to increases. Therefore it is important to study knit wear design practically, try a new technique, and represent creative designs. As a method of the study, visual and textural data were investigated for theory of knit and DTP and a variety of knit design samples were illustrated Especially, to perform a study based on the industry, this researcher worked and experienced at J fashion Ltd., knit wear promotion company. Firstly, the theory of DTP was investigated and then 3 knitted one-pieces were designed and produced. The concept of design was digital geometry which represented chic and modern image in digital age. Target was city adult group from the late teens to the late twenties and keeping open mind and active lifestyle and enjoying the activity and unique characteristics of knit wear. This study has developed knitted one-piece design by DTP technique which has been generally applied to woven fabric. This is of great significant in opening a new way of high value-added knit wear design.