The dress code in most organizations is as different as the organization itself, so it is impossible to find an outfit that will work well in all interviews. What should you do? Do some investigating and find out how the employees dress and follow their lead but dress just slightly better.
Wear business-like attire, avoiding flashy colours, bold prints, logos and keep jewelry to a minimum. Wear clothes in which you feel comfortable and don't wear skirts that will ride up when you sit. Carry a nice attaché case or folder to hold your resume and examples of your work.
Before you leave home check yourself in a full length mirror and have one last look for rips, runs in stockings (take an extra pair just in case you get a run along the way) and buttons that are about to fall off. A few extra points: