The basic theoretical research on sheath dress pattern with elastic fabric has put forward higher requirements. In this paper, based on dressing in dynamic change, combining with the body extend measure, the change of the pattern's control parts' specification and detail parts' specification are studied, and a basic sheath dress pattern with elastic fabric based on dynamic change is established. The human body's dynamic and static data show that the parameter of detail parts specification has great changes, while the parameter of control parts' specification parameter has small changes. For body detail parts' specification and structure, the parts that have not great changes only solve the problem of the fabric elastic utilization to meet the needs of the state of tight dress. According to the positions that produce dynamic increment, combining wearing condition, fabric elastic utilization and dynamic parameter, to design detail specification and pattern to satisfy sheath condition and dynamic demand.