This paper proposes a cloth design system that provides intuitive operations, e.g., sewing, cutting and fitting a cloth in a virtual 3D space through direct manipulations using a force-feedback device. This cloth design system also provides a collaborative environment that allows two users to design a common cloth collaboratively in a virtual 3D space through the Internet. A lot of cloth simulation algorithms and systems have been proposed and existed so far. However, there is no cloth design system that supports a force-feedback device and provides a networked-collaborative environment. So, the authors developed such a cloth design system. This paper describes what kinds of intuitive operations are implemented, how the collaborative environment is designed, and quantitative performances of the system to clarify its usefulness.