If you run a company or manage employees in an office environment, do you know the greenest thing you can do for the workplace? While using recycled paper, energy-efficient lighting and reusable cups are green choices, they aren't the greenest. Allowing a casual dress code for the office is. When employees have the freedom to dress casually, they wear fewer dry-clean-only suits and formal clothes, which cuts down on cleaning and the chemical used for it. Plus, studies show offices with a casual dress code also have the happiest and most productive employees.