Observations from both Seattle and Silicon Valley areas: managerial staff might be required to wear nicer jeans (w/o holes)/ khakis and polo shirts, but for lower level employees, the dress code is what Postmodern described in his post. 
Observations from both Seattle and Silicon Valley areas: managerial staff might be required to wear nicer jeans (w/o holes)/ khakis and polo shirts, but for lower level employees, the dress code is what Postmodern described in his post.