This study adopts the traditional costumes of the Pingwu Baima Tibetan ethnic group as a case, focusing on the color and pattern system to explore feasible pathways for the contemporary transformation of ethnic cultural resources. Based on cultural decoding, it interprets the narrative logic of color and analyzes the types, composition and connotations of patterns. A visual translation framework of “narrative decoding–gene extraction–translation and reconstruction” is established and verified through the design practice of the brand “White Feather Celebrating Spring”. The results demonstrate that this framework effectively promotes the creative transformation and value regeneration of cultural symbols, forming an operable paradigm from cultural interpretation to design generation, and provides a methodological reference for similar ethnic cultural innovation practices.