Many running shoes have reflective elements, but studies show it is best to have several reflective elements on to be seen from all directions. For walking comfort, dress in layers. The inner layer should be of a fabric such as CoolMax or polypropylene that will wick sweat away from your body to evaporate - not cotton, which holds it in next to the skin. The next layer should be insulating - a shirt or sweater easily removed if you warm up. The outer layer should be a jacket that is windproof, and waterproof or water-resistant in wet climates.
Hats are essential equipment.
They insulate you so you warm up faster. They shield the top of your head from the sun - an area where it is hard to apply sunscreen unless you are bald, but still burns. Hats with visors also shield your face from sun exposure. You don't drink enough water before, during, and after walking. Ten minutes before your walk, drink a glass of water.