Design a classic evening gown using traditional dip pen techniques to achieve fine details and intricate patterns. The gown should feature elegant silhouettes and flowing fabrics, rendered with delicate linework. Use hatching to create depth in the fabric, emphasizing the gown's luxuriousness. The model should be posed gracefully, showcasing the gown's movement. Incorporate soft lighting in the background to enhance the romantic atmosphere, making the gown the centerpiece of the sketch.
