Personal appearance is anoften disregarded part of communication and presentation skills.
When you are speaking in public, you may be representing your organisation or just yourself. It is still you at the front. It is you that the other person, group or audience sees and before you have time to open your mouth and say anything, certain assumptions, both consciously and subconsciously, have been made.
First impressions are very important – they can be about attitude as well as dress.
Visual impact is at least as important as verbal impact. People will very quickly make assumptions based on your personal appearance, including your facial expressions, the clothes you wear, how well-groomed you are and your body language.