Why do companies have business casual dress codes?

Organizations use dress codes to enforce varying degrees of uniformity and to communicate a specific message to employees and those that interact with the organization. Safety measures and industry requirements are also considered when deciding on a dress code.

Companies are very specific in what image they wish to convey, and this affects every visual or (semi-) public aspect of how the company is run. A business casual dress code allows a degree of freedom in dressing for employees, while still communicating that this is a serious business environment. A business casual dress code (as opposed to formal business wear) often communicates more creativity and warmth.