Mix tartan, velvet, leather, and brass by layering these textures across different decor elements. Use tartan ribbons on trees or mantels, velvet cushions or bows for softness, leather details in ornaments or furniture, and burnished brass accents in candle holders or trims. Balance them by repeating colors and varying scale. This combination brings old-world charm to 2025 holiday decorating and adds tactile interest while maintaining a relaxed, warm atmosphere.