Petaloid smocking is made of cloth by sewing and flattening pleats to create shapes over the surface. For dynamically visualizing the folding of pleats, this paper proposes an approach for creating crease patterns based on the rotation of shapes and pleat length. Dynamic visualization of petaloid smocking will contribute to avoiding the situation where the designed petaloid smocking cannot be actually produced due to the overlap of designed patterns, and to facilitating the shaping of flexible cloth. We show geometric characteristics of the crease patterns based on the proposed approach, and suggest a design framework with several examples of crease pattern. By designing a crease pattern with GeoGebra, the proposed approach is validated through the application to fashion goods. The shape of the produced bag can be transformed through folding, and fastened with magic tapes to enable variable size.