Polonious says:

1. Don't be too early, but never late.
2. Be comfortable with your appearance.
3. Avoid extremes unless you are trying to make a statement.
4. Hair length is generally immaterial so long as it is clean/trim
5. Men should look out for long nasal hair and hair on the ears, women should avoid very skimpy clothing.
6. Denim is normally a bad choice.
7. Wear no more than one bright colour or striped pattern.
8. If you have just eaten, check your teeth.
9. Body odour or bad breath is a disaster.
10. Appropriate follow up to any meeting/interview is a winner.