In the background of the information age, the development of all walks of life depends on the blessing of intelligent technology, and the clothing industry is no exception. This paper deeply explores the supporting role of generative AI in the creative ecology of clothing. The traditional fashion design mode is inevitably limited by the lack of materials or a lengthy cycle, and generative AI breaks this limitation, and with its powerful content generation ability, it effectively builds a bridge between creativity and the market. It can fully integrate cross-domain cultural elements and material data and help designers quickly turn abstract inspiration into visual design drawings. In addition, AI shows great value in cost control and supply chain coordination, which helps enterprises significantly reduce R&D losses and quickly respond to flexible demand. The research shows that it is the only way for the garment industry to enhance its core competitiveness by building a man-machine collaborative design system.