It is a subtle signal that you care about time and will be punctual. I also suggest carrying a pen in case you need to sign any documents or fill out paperwork. Doesn’t need to be an expensive fountain pen, just something that looks nice.
Wear a Watch
Shave or trim your facial hair. Get a haircut. Brush your teeth. Put lotion on your hands. Poor grooming can quickly bring a great outfit down.
Don't Forget Personal Grooming
Avoid wearing jeans, shorts, athletic wear, sandals and flip-flops, and t-shirts, especially graphic t-shirts. And anything dirty, damaged, or worn out.