Make sure you shower on a regular basis to eliminate body odour.
Use deodorant to prevent body odour
Make sure your hands and nails are cleaned
Make sure your shoes are polished
If you wear make up, make sure it is evenly applied.
Smokers should be aware of nicotine stains on your hands and the scent of smoke may be in your clothes, hair, hands and breath
Make sure your clothing is washed/dry/cleaned and ironed
Use after shave or perfume but make sure it is subtle
The colours you wear do have an impact. Make sure they compliment each other and do not clash.
Hair should be neatly combed
If you have a long hair, keep it away from your face