You don't want to be the candidate remembered for your outlandish hairstyle or heavy makeup.
Be careful with jewelry. Give yourself an item limit and choose carefully.
Make sure your clothes fit properly.
You don't want to look like you're wearing a borrowed outfit.
The right clothes won't get you the job by themselves, but the wrong outfit could cause you dearly.
If you look apart, potential employers are more likely to want to give you the job.
Judge for yourself.
Who's the most employable of these candidates?