This paper proposes an approach for drawing crease patterns based on the rotation of decorations and pleat length so that the folding process of petaloid smocking, which have been used as decorations over cloths, can be visualized. Visualization of petaloid smocking would be effective for avoiding the situation where the designed petaloid smocking cannot be actually produced due to the overlap of decorations, and to facilitating the production of petaloid smocking over flexible cloths. We show geometric properties of the crease patterns by the proposed approach, and suggest a design framework with several illustrating examples. By designing crease patterns using GeoGebra, the proposed approach is validated through the application to fashion goods. The shape of the produced fashion goods decorated with petaloid smocking can be transformed through folding and unfolding of cloths to change its size.