Dress appropriately for your company and office. Your appearance is often the first thing that people judge you on; when you look like a professional, you are more likely to be perceived as a professional. For many offices this would require business attire, such as a suit or pressed slacks and a button-down shirt. Even if your office dress code is on the casual side, you can still maintain a professional appearance by being dressed in clothing that have been laundered and pressed, fits well and does not have any holes or rips. For example, rather than a t-shirt, you might choose a pressed shirt and cardigan sweater.