For the last business day of the week, why not choose this style?
Good color coordination, not too formal and not too casual either.
Do a little mixing with colors and styles and you have a wonderful office looking outfit. You can than go to that after work party to loosen up a bit. It is the end of the business week after all and you won’t have to worry about being too formal or office looking like.
Brown shoes work well with navy pants. Grey, being neutral, works well with almost everything. And pairing these two colors will not be a problem.