<p>Museums often rely on traditional methods, such as static displays and text-based explanations, to preserve and showcase cultural heritage. However, these approaches lack interactivity and fail to engage modern audiences effectively. This research integrates generative artificial intelligence and the metaverse to preserve and promote Lamphun Brocade Fabric, a traditional textile from Northern Thailand. Using data from the Wieng Yong House Museum, which houses over 100-year-old brocade artifacts, we developed an immersive virtual environment featuring a generative AI-powered virtual assistant. Visitors can explore the cultural significance of the fabric by interacting in real time with the virtual assistant for guided tours and personalized learning. This study provides a practical implementation of generative AI for cultural heritage, addressing technological opportunities, challenges, and limitations in the metaverse. Additionally, it supports artisans by promoting Lamphun Brocade Fabric on a global platform, fostering awareness and sales. By combining education, technology, and preservation, this research highlights the potential of generative AI and the metaverse to transform cultural heritage engagement and dissemination.</p>