NEW YORK — Bob Mackie’s fall collection is full of the requisite sensuality, flash and glamour. But the latest news is more about his temperance. And this reserve appears for both day and evening — in the form of soft cashmere and silk T-shirts over lean pants, crisp luncheon dresses and svelte suits. Even a dressy velvet coat gets a tailored touch, shown over a sleek, knee-length sheath. Along with his traditional nighttime glitz, Mackie shows a more modest approach for after dark with controlled shapes and soft fluid fabrics.