Clothing for a night walk follows the same layering logic as any other walk, with a couple of extra points to think about.
Base layer: something breathable that manages sweat, since temperature swings feel bigger after dark once you stop moving.
Mid layer: a fleece or light insulated top for the cooler air that settles in once the sun's gone.
Outer layer: a waterproof jacket, since a shower feels a lot colder and harder to judge in low light.
Reflective elements: this is the bit that's different from a normal walk. Look for jackets, gilets, or accessories with reflective piping or panels, or add a clip-on reflective band to your rucksack strap. Bright colours such as yellow, orange, or lime green also help in the last light of dusk, before full darkness sets in.
Footwear: stick with boots or shoes that grip well on wet or uneven ground, since spotting a loose stone or muddy patch takes a fraction of a second longer by torchlight than it does in daylight.