As with your last query ("paete" = "pailette" = "sequin" or "spangle"), here again you have a borrowing from the French. "Matelasse" (with an accent-aigu on the last "e") refers to an object that is padded, lined, or quilted (for example, "matelasse' de soie" = "silk-lined"). Given that your "stylist developed new textures...." with "vibrant colors," I would lean toward "quilted" as the most appropriate choice in this case (subject, of course, to further contextual information). Best regards, HC