Create a vibrant Double Ninth Festival poster for a fashion brand. The design should feature light green and pastel pink, symbolizing the brand’s colors. Highlight traditional customs such as climbing a high mountain, wearing a sprig of dogwood (zhuyu), and admiring chrysanthemums. The overall aesthetic should be elegant and modern, reflecting both the festival's traditions and contemporary fashion." --ar 9:16 --v 6.1

为时尚品牌制作一张充满活力的重阳节海报。设计应使用浅绿色和粉彩粉色，象征品牌的颜色。突出传统习俗，比如登高、佩戴朱砂枝和欣赏菊花。整体美学应优雅现代，既反映节日的传统，又展现当代时尚。