I'm a senior manager on the East Coast and I am going for an interview next week with a Silicon Valley startup in Sunnyvale, California. The position I'm going for is a East Coast position since they are expanding here, but I'm perplexed about what to wear to the interview. The usual would be a navy or charcoal suit, white shirt, blue solid or striped tie, black shoes. However, my understanding is that the business environment is very different out there and I don't want to show up to a hippie commune looking like a "suit". The interview is for an East Coast regional management position (NY, CT, PA, DE, DC, VA) and the industry is in the energy sector. I would be expected in interface with clients etc. What is the correct level of attire and is the classic interview get-up too somber? Suggestions and comments appreciated.