Well, I'm guessing women should wear suits, if they want to wear suits, whether Project Runway hosts approve or not.
If, on another hand, you are looking for options, consider choosing a simple long dress with clean lines paired with non-flashy heels and a belt. You can either wear a professional-looking jacket over it, or a cardigan (depending on your work environment). A pencil skirt can go a long way, as well. You can also choose a more relaxed skirt, if your top is professional-looking. If you don't like heels, there is an incredible amount of charming flats that is out there today.
Find a haircut that you can master and do perfectly in 10-20 minutes (my choice is a crown braid), use eye-liner and lipgloss. Done!