Don't feel that you have to go out and buy a whole new wardrobe. In fact, you probably already have a lot of the looks and styles hanging in your closet right now.
All companies have their own dress codes, which range from suits to jeans.
Find out what the company's dress code is before you go start working. Most companies provide employees with a list of non-acceptable fashions. When in doubt, leave it out. You'll want to be prepared a financial office will have a very different idea of business casual than an advertising agency. If you're a new employee or even going in for an interview, always ask about dress code since so many companies are now adopting a more casual environment.