"Marissa Mayer’s ascent up the corporate ladder and to the top of the tech world are enough to make her the mentor every working woman wants. But her uncanny ability to perfectly answer that age-old fashion question: What is work-appropriate? is equally worth emulating. During her early days at Google, she stood out not only as a star coder, but in her polished Carolina Herrera and Oscar de la Renta separates, as a style setter in Silicon Valley. Her look became her trademark, setting her apart from the sea of hoodies and flip-flops that are so prevalent in West Coast tech world boardrooms. So, while this CEO of the moment is trending, we decided to take a page from her playbook, with our Monday through Friday guide highlighting what to wear to work. Add these looks to your iCal now."