Parks suggests candidates take a good look at themselves before going out the door. Some candidates show up dressed like they are going to a club. I recommend a more conservative look. Some candidates come in very late, some don't even show and don't even have the courtesy to call. Being punctual is imperative.
Nothing beats a clean-cut hairstyle when it comes to a professional look.
Avoid long hair, pony tails and extreme hairstyles and colors. Shine your shoes. You may not have money to buy a brand new pair, but a good buff and polish is all your old shoes need. We're not saying to go and get a manicure, but do clip and file your nails. Clean hands and nails are a big plus.