Petaloid smocking is a handcraft technique of producing the decorations of flower shapes over the surface of cloths. However, since cloths are too flexible to sustain the decorations, it is not easy to produce desired decorations over cloths by fattening and arranging pleats. Toward supporting the forming of petaloid smocking, this paper proposes to generate strings based on crease patterns of petaloid smocking. Based on the folding map of crease patterns, algorithms to generate strings to support the forming of petaloid smocking are proposed. The proposed method is implemented using GeoGebra, and is verified through the application to fashion goods decorated with petaloid smocking.