I'm not trying to white-knight here. I know plenty of women engineers that fall into those categories as well - engineer/hoodie, sales/suit, etc. Would it be that hard in the Bay Area to find a woman engineer in jeans and a hoodie?

It doesn't require an in-depth analysis of the entire breadth of womens' fashion to imply that yes, there are women engineers, and yes, a lot of them dress exactly like the men.