Our Head of Resources, Gill Kellard, is a Master member of the Federation of Image Consultants and explains why image matters in the world of work.

It's tempting to think that life would be so much easier if you could just stroll down to the office without even bothering to glance in the mirror. But, whether you like it or not, your appearance gives a vital clue as to your professionalism and getting it right could make the difference between others taking note of your input – or ignoring it.

Business cares about visual clues. Every year millions of pounds are spent on creating the right image. If, as a professional, you see yourself as a business, then you should look on your appearance as your company logo – your image communicates to others not just how you see yourself but also how you wish to be seen.

At interview, research shows that seven seconds are all it takes to make a crucial first impression. If the interviewer does not like what he or she sees, they are less likely to listen to what you have to say. In other words, if your clothes could talk, you'd want them to say: ‘I can do the job. I will do the job. You can trust me.'

But clothes are just part of your overall package. If you are a manager, for example, you should look as though you are in charge. While a smart briefcase might boast efficiency and authority, a tatty bag that bulges with crumpled papers risks screaming a lack of preparation, organisation and even lack of responsibility.

So, what are the most common mistakes professionals make in the image stakes?

Badly fitting clothes. Aim for a loose yet comfortable fit. Too tight and your clothes might expose flesh and possibly distract the listener from what you are saying. If necessary, get your clothes altered to ensure that just a couple of centimetres of cuff rather than several inches show under sleeves. Your trousers should end on your shoes not concertinaed around your ankles, or worse, expose your leg above the sock.

Badly co-ordinated clothes are another No-No. The best way to dress is to select a basic neutral palette and build on this by adding accents of colour in shirts or ties.

Badly cared for clothes. An outfit that is very worn or creased or crumpled and shoes, handbags or briefcases that are scuffed, unpolished or past their best give the wrong message. Its simple: invest in an iron, polish shoes and get rid of battered bags.

Poor personal grooming. You might have been in a hurry this morning, but there is no excuse for a careless shave. Similarly, a poor complexion fails to impress as do bad breath, dandruff on the collar and unkempt or excessive facial hair. All the above indicate a lack of personal pride. Dirty fingernails don't wash at the office.

Dated or inappropriate accessories include quirky spectacle frames or chunky plastic watches that make you look as if you should be deep sea diving or mountain climbing. Likewise, ‘amusing' ties or socks are inappropriate for your role and your audience at work – there are far more effective ways to express your character and individuality than to rely on cartoon characters who are as likely to offend as endear others to you.

Above all, remember that in the world of business your look is effectively your logo. Invest time and money in your appearance and your career will reap the benefits. Take control of your image in the office – and you will work wonders.