Coaching
Clothes make the man, and they always have. Clothes in this context has a wider meaning and includes both shoes and hairstyle. The reason our external appearance is so important is that human beings are more oriented by what they see than almost anything else. And they will usually see you before they hear you, so by the time you start to speak people will have created some sort of impression. So take your visuals seriously; like it or not, they actually matter more than the facts you have to tell. If you need to go before an audience, on camera or off, have your hair done a week ahead of the date. That way, you’ll look good, but people won’t get the impression you just walked in from the barber shop.
Next, check your shoes. Keep in mind that many interviews are done seated, meaning the camera will have a view of the soles of your shoes and also your ankles. Make sure your shoes are clean, and, gentlemen, please watch the length of your socks. As anywhere else, the less skin a man shows, the better he looks, and this is especially true of hairy male calves. Not only are they an ugly sight, they are irresistible for any camera operator. The moment they appear on screen, people will be distracted from what you say and stop listening. Loud patterns and colours will do the same thing.
So make sure your appearance is pleasant without being showy. Make it easy for your audience to listen to you.